For those of you looking for Android 8.1 Oreo Gapps, we recommend using the Beans Gapps, which gives you minimal apps(just the Play Store) and will work on any Android custom ROM running Android 8.1 Oreo.
Download Android 8.1 Oreo ARM64 Gapps – ARM64 This is newer devices with 64-bit processor such as Galaxy S9 Plus, S9, Note 8, S7, and S6
Download Android 8.1 Oreo ARM Gapps – ARM This is for older devices with 32-bit processor such as Galaxy S5, S4, Note 4, etc…
P.S. This Gapps works on any Android custom ROM including Lineage ROM, Resurrection Remix ROM, AOKP ROM, etc…etc..
How to install Android 8.1 Gapps?
You can use TWRP recovery to install Android 8.1 Gapps. Make sure you are using the latest version of TWRP(you can grab latest version at TWRP.me) and install these Gapps as you will get error if you are using older version of TWRP. For CWM, it should be fine to use an older version.