My dad is working on a '90 model 350 right now and he is having trouble getting the correct motor for the power window. The motor in the truck was a part#55154533, but chrysler said that that part was discontinued but that part #55154645 was a direct replacement, but it does not fit, apparently the gear sticks out to far and will not bolt to the regulator. Grey Wolf said in an earlier post that there were actually 2 motors on the early '90 models. Im guessing that the 45 part is the other motor used during that year. As my dad would prefer using an OEM part, does anyone know of a source for the 33 motor, or if you cannot get them, a aftermarket replacement part #? Thanks, Eric