Looking for 88 integra window regulator gearbox thingy

I have an 88 integra who's driver's side window regulator is broken. Specifically, the little gearbox in which the window handle attaches is pretty well ground up and ruined. It looks like this little gearbox (about the size of a walnut) could be replaced with a bolt in replacement. The original one is attached to the regulator with rivets. Does such a replacement exist? Like from the little odds and ends you might find in the "Help!" section of an auto parts store?