I have a few CAT(Delco 37-MT) starters for sale that came off brand new engines(C7's) from the factory. They were only used at the factory- and then taken off at the dealer because the customer requested air powered starters. They will fit many engines, so you have to do some research- they are 12-tooth, 12-volt, clock-wise rotation. They have paint and scratches on them but are NEW. I can post some pics if necessary. I will likely put them on ebay at a cheap reserve/buy it now.