Fat 2nds

You've got the old wide seconds, as do the knorb pistons. We looked up sets by size a while back, looking for something to fit one of my 427's that's at .040 with wides, and were able to find something that was close enough to file fit. A good man with a parts catalog (and some imagination) can probably help you out. Might look into if there's an available spacer to allow use of a narrower ring- we used to do that to be able to run a Dykes ring in a 5/64 groove