You can actually use a file and an exacto knife and some sandpaper on an aftermarket door. They tried to make an L-shaped reinforcement on the right side (if looking at the PSP from the back) that's why it's quite hard to get it in past those screws, just shave and file and sliver little by little, until it fits in without even having to take off the front case. You may also have to do some trimming and gluing of the latch catch on most of these aftermarket UMD doors.