Roelof thanks mate,
That would explain why I can't find a foam bumper.
I feel slightly embarrassed about asking this question now and the question really indicates just how green I am at onroad racing.
I've only been building and bashing around 1/8th buggies off and on for the last 20 years of so.
I was also under the impression that all onroad cars at race meetings required foam bumpers for safety reasons?
I,m certainly on a steep learning kerb but I'm really enjoying it and can't wait to start building my RX8, complete the build and get to the track to run the engine in and tune the chassis while I do a thousand or so laps to get race ready and used to driving on the tarmac.
Once again thanks for the answer and I'm sure that I'll be back here to get more advice and help.
Cheers