'52 Merc 6 V power windows,,One rear quarter is giving me fits. Spare motor is bad, I broke the brush holder on one, tried to make one out of two.. Should work, but somethings is not right.. A good motor man I am sure could make it work.. Rear motors are different than fronts,, Rear the armature is longer with a worm gear cut in it,, Front motor is shorter with a tang to drive the regulator.