To ensure compatibility, users must select a package based on their device's CPU architecture: Most older 32-bit smartphones and tablets.
If you want to de-Google your device but still need push notifications and location services, consider . It is an open-source reimplementation of Google Play Services that works exceptionally well on Android 5.1 custom ROMs.
(then CyanogenMod) due to licensing, every enthusiast had to find the perfect "GApps package" to bridge the gap. The Quest for the Package
“Install GApps for Android 5.1.”
The Digital Bridge: Understanding GApps for Android 5.1 Lollipop