Thanks Angus, and BSA-Bill, and now Musky has entered the fray. THANKS ALL> The googlemail address is the correct one.
I did not expect one gasket to be so spendy, Roger told me they are
pound 12 each, which translates to $19.00 per gasket in U S money. I did not expect these to be quite so pricey, but I guess some body has to pay for the Tooling that Roger had to develop, because BSA discontinued this Gasket almost as soon as the unit motors came out in 1963. It has been a lot of years since that has been a good BSA part number. I think for now I will just keep using my wood jig I made on a taper, to file a regular soft type Insulator down on a taper.