This one is an OS 60 FP. I've also done an OS 46 FX and a Saito 150. The Saito is waiting for the wristpin plastic plugs and a backplate gasket. I'm also adding the choke slide to it. The 46 runs like a champ. I should have gotten more on my buddy's lack of oiling but with him if I insisted, he'd have me do it. Oh well. I've gotten some info that what I'm looking for is gasket paper. If I wasn't retired, I had a good source of the paper large bearings are wrapped with - that would have worked. I've also come across Felpro 3045 - a 1/64 gasket material. I'll stop by our local auto parts store tomorrow and see if they have any.