I've got a pair of Shaw Aero fuel caps, part #431-9R that seem to be in great condition. I bought them years ago for spares, only to discover they're not right for my J model. I re-discovered them while working in the hangar over the weekend and figured someone else here can use them. I believe they're correct for pre-J Mooneys. There is a "26" stamped on the face for the tank capacity. They are in nice shape, and the cam action feels very nice and tight. O-rings I'm sure are shot so the buyer will need new ones. I don't have a parts manual for the pre-J Mooneys so please check you part number if you're interested so you don't make the same mistake I did!
I'd like $150 for the pair. A quick look on ebay showed some individual caps going for $95 each so hopefully this is fair.