B40 piston rings

[Greenfield]

Does anyone know of anywhere that stocks B40 piston rings? I bought a set of new Italian ones but they are too wide to fit in the bore once fitted to the piston. Seems like its a common problem. I've tracked down compression rings, old stock, but haven't found an oil scraper ring to fit; its +60 thou. There must be some somewhere.
I've got my fingers crossed.

[AWJDThumper]

The rings are the same size as for a B44 (79mm bore). If you can't find them anywhere else you can get them from:

http://www.vintage-motorcycle.com/index.php?language=en&site=4&pid=103&limit=30