Looking for a R&L Hand Pr of TRS's
 

I'm thinking of buying a pr. of back-up TRS drives. 1.5:1 ratio, drives only, don't need rams or transom plates. Only interested in good or very good bolt-on condition: rebuilt or have a verifiable history. I would also consider a single- I have a spare already with just a broken shaft gear. If anyone has anything that fits the bill, please respond. Also, can someone explain what the deal is with the # of teeth in the Pinion and Drive gear sets? Pinion has 16 teeth, Drive has 18? Seems like they ought to match....