Wanted, rear drive cush rubber

Ugh! Me and my impatience! :pinch:

I tried to get the cush rubber out of the rear wheel hub without realising it is secured with rubber grommets. In my ignorant haste I snapped two grommets off and broke the rubber 'ring'. Now it is in two parts and, if I put it back, unsecured...

I have to admit the rubber is pretty tired and brittle with age, so I really want a better (new?) one, but cannot find one anywhere online.

Has anyone got one that is still useable?

Cheers
Paul (London, UK)