This is a brand new fiber washer and O-ring set.

Part number: 67-0042 Oil tank filler cap fiber washer (quantity of 1)               
                      68-8336 Oil filter fiber washer early model from 1962-67 (quantity of 1)               
                      68-0610 Oil filter O-ring later model from 1968-70 (quantity of 1)

Fits: BSA A50, A65 from 1962-70