Backwards Support for Firebase\Google play 60.1142.0?

[RickB864]

For a couple of reasons beyond my control, I have to reference several Firebase/Google play packages that reference version 60.1142.0. Any chance someone could create a version that is backwards compatible with 60.1142.0?

[cassionandi]

Maybe I should do that do avoid this error?

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets(3,3): Error: java.lang.IllegalArgumentException: already added : Lcom/google/android/gms/ads/identifier/AdvertisingIdClient; (MyApp.Android)