Uhg, that sucks.

Rule #1 should always be, when shopping for a used car, DON'T buy a car with questionable (or any at all) mods, heh.

Unsure what all went into getting this mod to work, but its most likely poppers, so if you do a swap with someone, you are still looking at some brute force labor. Seriously doesn't sound like fun and I dont envy you. Your best bet would probably be to just get the door poppers to work "right".