Got these five Indian made steel primary chain case gaskets from Heritage Garage based in Ilford UK off ebay,they work out at £5.50p each and are 1/8 inch thick (2.5mm) as were the originals,they fit great insisde of an outer chain case cover (see photo) all holes line up nicely,I would rate these as a very good product for the price,you would have to contact Heritage Garage to see if they have any more stock,or more arriving.