Might be hard to find, because I think grab rails if you mean the one that goes around the back end of the dual seat were only fitted to some (but not all) a10's exported to the North American market. There are plenty of grab rails advertised for the A65 from 1970 on. Weather these would fit I do not know. I have catalogues from several BSA spares suppliers but none list an a10 grab rail. The lifting rail as fitted to a10's if that is what you meant is available however.