OTC is the company that makes the tappet holder/compressor. Although the name of the company might have changed (now SPX???) I was able to get them last March. Go to SHOTIMES.com and look under Care and Feeding of the SHO, then look under adusting valve lash. It has the telephone number for customer service and the part numbers. FYI, when you do your adustment, tape a string to the tappet holder and tie the other end to something in the engine. The holder can pop out and fall into the engine compartment and it can be hard to find.