Moto Rapido do have them in stock.
Rubber buffer 19540021A.. It's a quid. So problem solved.
Just need to make an order up to £10 so they will post it. No problem as I keep sump plug washers and exhaust gaskets on the shelf... Must be due for a re-stock.
Thanks for the heads up Luddite and all the other tips along the way, except for Darkess's suggestion of making one in Titanium...Good job I know you're joking..