diff --git a/build-scripts/component-common.gradle b/build-scripts/component-common.gradle
index f4b1f5a78b..2d1266d18e 100644
--- a/build-scripts/component-common.gradle
+++ b/build-scripts/component-common.gradle
@@ -117,17 +117,17 @@ ext.configureUniFFIBindgen = { crateName ->
         // in moz-central we can use an `Exec` task because we can assume the bindgen tool has already been built.
         generateUniffiBindings = tasks.register("generateUniffiBindings", Exec) {
             def libraryPath = "${gradle.mozconfig.topobjdir}/dist/bin/libmegazord.so"
-            def megazordNative = "${gradle.mozconfig.topobjdir}/dist/host/bin/embedded-uniffi-bindgen"
+            def bindgen = gradle.ext.mozconfig.substs.EMBEDDED_UNIFFI_BINDGEN
 
             workingDir project.rootDir
-            commandLine "${gradle.mozconfig.topobjdir}/dist/host/bin/embedded-uniffi-bindgen"
+            commandLine bindgen
             args 'generate', '--library', libraryPath, "--crate", crateName, '--language', 'kotlin', '--out-dir', uniffiOutDir.get(), '--no-format'
 
             outputs.dir uniffiOutDir
-            // Re-generate when the native megazord library is rebuilt
-            inputs.files megazordNative
+            // Re-generate when the native megazord library is rebuilt                                ... 
+            inputs.files libraryPath
             // Re-generate if our uniffi-bindgen tooling changes.
-            inputs.dir "${project.appServicesRootDir}/tools/embedded-uniffi-bindgen/"
+            inputs.files bindgen
         }
     } else {
         // In app-services we can't use `Exec` because the megazord target isn't built yet, which we force via `doFirst`
diff --git a/components/ads-client/src/http_cache/clock.rs b/components/ads-client/src/http_cache/clock.rs
index 81789b66eb..778a5ce7c9 100644
--- a/components/ads-client/src/http_cache/clock.rs
+++ b/components/ads-client/src/http_cache/clock.rs
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 pub trait Clock: Send + Sync + 'static {
     fn now_epoch_seconds(&self) -> i64;
     #[cfg(test)]
diff --git a/components/support/nimbus-fml/moz.build b/components/support/nimbus-fml/moz.build
deleted file mode 100644
index 996c19acdf..0000000000
--- a/components/support/nimbus-fml/moz.build
+++ /dev/null
@@ -1,19 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-HOST_RUST_PROGRAMS = ["nimbus-fml"]
-
-# copy-pasta from other moz.build file.
-if CONFIG["MOZ_WIDGET_TOOLKIT"] == "cocoa":
-    OS_LIBS += ["-framework CoreFoundation"]
-elif CONFIG["OS_TARGET"] == "WINNT":
-    OS_LIBS += [
-        "advapi32",
-        "wsock32",
-        "ws2_32",
-        "mswsock",
-        "winmm",
-    ]
diff --git a/components/viaduct/src/ohttp_client.rs b/components/viaduct/src/ohttp_client.rs
index 68369d6b64..6cdf6a5e8c 100644
--- a/components/viaduct/src/ohttp_client.rs
+++ b/components/viaduct/src/ohttp_client.rs
@@ -1,3 +1,7 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
 use crate::ViaductError;
 use parking_lot::Mutex;
 use std::collections::HashMap;
diff --git a/examples/nimbus/Cargo.toml b/examples/nimbus/Cargo.toml
index fde413c2f0..2da7290097 100644
--- a/examples/nimbus/Cargo.toml
+++ b/examples/nimbus/Cargo.toml
@@ -10,4 +10,3 @@ error-support = { path = "../../components/support/error", features = ["testing"
 viaduct-hyper = { path = "../../components/support/viaduct-hyper" }
 clap = { version = "4.2", default-features = false, features = ["std", "derive"] }
 remote_settings = { path = "../../components/remote_settings" }
-
diff --git a/tools/embedded-uniffi-bindgen/Cargo.toml b/tools/embedded-uniffi-bindgen/Cargo.toml
index 68a0c9bbea..f5a3138409 100644
--- a/tools/embedded-uniffi-bindgen/Cargo.toml
+++ b/tools/embedded-uniffi-bindgen/Cargo.toml
@@ -10,4 +10,4 @@ license = "MPL-2.0"
 name = "embedded-uniffi-bindgen"
 
 [dependencies]
-uniffi = { version = "0.29.0", features = ["cli"] }
+uniffi = { version = "0.29.0", default-features = false, features = ["cli"] }
diff --git a/tools/embedded-uniffi-bindgen/moz.build b/tools/embedded-uniffi-bindgen/moz.build
deleted file mode 100644
index 24201609d9..0000000000
--- a/tools/embedded-uniffi-bindgen/moz.build
+++ /dev/null
@@ -1,19 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-HOST_RUST_PROGRAMS = ["embedded-uniffi-bindgen"]
-
-# copy-pasta from other moz.build file.
-if CONFIG["MOZ_WIDGET_TOOLKIT"] == "cocoa":
-    OS_LIBS += ["-framework CoreFoundation"]
-elif CONFIG["OS_TARGET"] == "WINNT":
-    OS_LIBS += [
-        "advapi32",
-        "wsock32",
-        "ws2_32",
-        "mswsock",
-        "winmm",
-    ]
diff --git a/tools/import-app-services-to-central.sh b/tools/import-app-services-to-central.sh
index ec5a6bedcb..aaf9d60716 100755
--- a/tools/import-app-services-to-central.sh
+++ b/tools/import-app-services-to-central.sh
@@ -27,10 +27,13 @@ export MOZ_AVOID_JJ_VCS=1
 moz-phab patch --apply-to=here --skip-dependencies --no-branch D260481
 # Bug 1981871 - Make `./mach rusttests` run some tests via cargo directly,
 moz-phab patch --apply-to=here --skip-dependencies --no-branch D260480
-# gradle
-moz-phab patch --apply-to=here --skip-dependencies --no-branch D245762
 # enable `--with-appservices-in-tree` config option by default
 moz-phab patch --apply-to=here --skip-dependencies --no-branch D263599
+# entire toolchain stack
+moz-phab patch --apply-to=here --no-branch D266035
+# unstub toolchain - depends on above but not stacked.
+moz-phab patch --apply-to=here --skip-dependencies --no-branch D274371
+
 # vet nimbus, rc_crypto, ece, etc
 moz-phab patch --apply-to=here --skip-dependencies --no-branch D258722
 # lint
@@ -52,7 +55,7 @@ rm -rf gradle
 rm proguard-rules-consumer-jna.pro
 rm install-nimbus-cli.sh
 rm rust-toolchain.toml
-rm -rf components/external
+rm -rf components/external || true # `components/external` is going away - https://github.com/mozilla/application-services/pull/7103
 rm -rf docs/shared
 # need a story for these generated deps - bug 1963617
 rm DEPENDENCIES.md megazords/full/android/dependency-licenses.xml megazords/full/DEPENDENCIES.md megazords/ios-rust/DEPENDENCIES.md megazords/ios-rust/focus/DEPENDENCIES.md
@@ -215,7 +218,7 @@ cargo update -p gkrust-shared
 cargo update -p expect-test --precise 1.4.1
 cargo update -p fragile --precise 2.0.0
 cargo update -p mockito --precise 0.31.0
-cargo update -p predicates --precise 3.0.4
+cargo update -p predicates --precise 3.1.3
 cargo update -p predicates-core --precise 1.0.6
 cargo update -p predicates-tree --precise 1.0.9
 
@@ -227,8 +230,8 @@ sed -e 's|/dom/webgpu/tests/cts/vendor/target/|/dom/webgpu/tests/cts/vendor/targ
 mv .gitignore.tmp .gitignore
 # .hgignore needs the same, but with a leading `^` instead of `/`
 sed -e 's|\^dom/webgpu/tests/cts/vendor/target/|^dom/webgpu/tests/cts/vendor/target/\
-^services/app-services/**/target/\
-^services/app-services/**/Cargo.lock|' \
+^services/app-services/.*/target/\
+^services/app-services/.*/Cargo.lock|' \
   .hgignore > .hgignore.tmp
 mv .hgignore.tmp .hgignore