If you have a game gear where the d pad membrane has a ball bearing, you Need to buy their membrane kit or modify your own for it to work with the d pad (unless I missed something.)
I didn't investigate until the new white shell was being screwed together, and one of the screws holding the shell together became stripped so I had to break the new case (and break a few wires) to swap the dpad for the original.
But I like the original better anyways.
So general heads up, you need to have a d pad membrane with no spot for a ball bearing or buy their membrane kit. Otherwise the d pad will not work unless you sand half of it off.