diff --git a/apex/apex.go b/apex/apex.go
index 69eea03..492e4f0 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -224,6 +224,9 @@
 	// Name that dependencies can specify in their apex_available properties to refer to this module.
 	// If not specified, this defaults to Soong module name.
 	Apex_available_name *string
+
+	// Variant version of the mainline module. Must be an integer between 0-9
+	Variant_version *string
 }
 
 type ApexNativeDependencies struct {
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 0598836..c781be4 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -6717,6 +6717,89 @@
 	}`)
 }
 
+func TestApexAvailable_ApexAvailableNameWithVersionCodeError(t *testing.T) {
+	t.Run("negative variant_version produces error", func(t *testing.T) {
+		testApexError(t, "expected an integer between 0-9; got -1", `
+			apex {
+				name: "myapex",
+				key: "myapex.key",
+				apex_available_name: "com.android.foo",
+				variant_version: "-1",
+				updatable: false,
+			}
+			apex_key {
+				name: "myapex.key",
+				public_key: "testkey.avbpubkey",
+				private_key: "testkey.pem",
+			}
+		`)
+	})
+
+	t.Run("variant_version greater than 9 produces error", func(t *testing.T) {
+		testApexError(t, "expected an integer between 0-9; got 10", `
+			apex {
+				name: "myapex",
+				key: "myapex.key",
+				apex_available_name: "com.android.foo",
+				variant_version: "10",
+				updatable: false,
+			}
+			apex_key {
+				name: "myapex.key",
+				public_key: "testkey.avbpubkey",
+				private_key: "testkey.pem",
+			}
+		`)
+	})
+}
+
+func TestApexAvailable_ApexAvailableNameWithVersionCode(t *testing.T) {
+	context := android.GroupFixturePreparers(
+		android.PrepareForIntegrationTestWithAndroid,
+		PrepareForTestWithApexBuildComponents,
+		android.FixtureMergeMockFs(android.MockFS{
+			"system/sepolicy/apex/foo-file_contexts": nil,
+			"system/sepolicy/apex/bar-file_contexts": nil,
+		}),
+	)
+	result := context.RunTestWithBp(t, `
+		apex {
+			name: "foo",
+			key: "myapex.key",
+			apex_available_name: "com.android.foo",
+			variant_version: "0",
+			updatable: false,
+		}
+		apex {
+			name: "bar",
+			key: "myapex.key",
+			apex_available_name: "com.android.foo",
+			variant_version: "3",
+			updatable: false,
+		}
+		apex_key {
+			name: "myapex.key",
+			public_key: "testkey.avbpubkey",
+			private_key: "testkey.pem",
+		}
+	`)
+
+	fooManifestRule := result.ModuleForTests("foo", "android_common_foo_image").Rule("apexManifestRule")
+	fooExpectedDefaultVersion := android.DefaultUpdatableModuleVersion
+	fooActualDefaultVersion := fooManifestRule.Args["default_version"]
+	if fooActualDefaultVersion != fooExpectedDefaultVersion {
+		t.Errorf("expected to find defaultVersion %q; got %q", fooExpectedDefaultVersion, fooActualDefaultVersion)
+	}
+
+	barManifestRule := result.ModuleForTests("bar", "android_common_bar_image").Rule("apexManifestRule")
+	defaultVersionInt, _ := strconv.Atoi(android.DefaultUpdatableModuleVersion)
+	barExpectedDefaultVersion := fmt.Sprint(defaultVersionInt + 3)
+	barActualDefaultVersion := barManifestRule.Args["default_version"]
+	if barActualDefaultVersion != barExpectedDefaultVersion {
+		t.Errorf("expected to find defaultVersion %q; got %q", barExpectedDefaultVersion, barActualDefaultVersion)
+	}
+}
+
 func TestApexAvailable_ApexAvailableName(t *testing.T) {
 	t.Run("using name of apex that sets apex_available_name is not allowed", func(t *testing.T) {
 		testApexError(t, "Consider adding \"myapex\" to 'apex_available' property of \"AppFoo\"", `
diff --git a/apex/builder.go b/apex/builder.go
index 7c6522d..c691a33 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -275,6 +275,22 @@
 
 	manifestJsonFullOut := android.PathForModuleOut(ctx, "apex_manifest_full.json")
 	defaultVersion := android.DefaultUpdatableModuleVersion
+	if a.properties.Variant_version != nil {
+		defaultVersionInt, err := strconv.Atoi(defaultVersion)
+		if err != nil {
+			ctx.ModuleErrorf("expected DefaultUpdatableModuleVersion to be an int, but got %s", defaultVersion)
+		}
+		if defaultVersionInt%10 != 0 {
+			ctx.ModuleErrorf("expected DefaultUpdatableModuleVersion to end in a zero, but got %s", defaultVersion)
+		}
+		variantVersion := []rune(*a.properties.Variant_version)
+		if len(variantVersion) != 1 || variantVersion[0] < '0' || variantVersion[0] > '9' {
+			ctx.PropertyErrorf("variant_version", "expected an integer between 0-9; got %s", *a.properties.Variant_version)
+		}
+		defaultVersionRunes := []rune(defaultVersion)
+		defaultVersionRunes[len(defaultVersion)-1] = []rune(variantVersion)[0]
+		defaultVersion = string(defaultVersionRunes)
+	}
 	if override := ctx.Config().Getenv("OVERRIDE_APEX_MANIFEST_DEFAULT_VERSION"); override != "" {
 		defaultVersion = override
 	}