A new rocker box gasket for BSA B25 and Triumph TR25 motorcycles.

Please note that some holes are smaller than others and so this gasket needs fettling in order to fit.  Looking at other suppliers of these on ebay, the same is true of other peoples' gaskets too, it appears that the manufacturers tooling is at fault and you are unlikely to find a gasket that doesn't need fettling.  We suggest the use of a punch.