Gapps Manager easy lets you download the proper gapps (google apps) flashable zip package to install on your custom ROMs.
Currently, it supports gapps for gingerbread (2.3.x), ics (4.0.x), jellybean (4.1.x-4.3.x), and kitkat (4.4.x), art support also available.
Not sure what version of android you're on? It can tell you that also, just select android version when you open the menu.
Never bother with searching for compatible gapps again, or waste your time ending up with gapps that don't work properly for you.
*Gingerbread force close fix
*Added a download complete notification
*Minor bug fixes