Been thinking a bit about this.
We should use:
The oldest gear you own! That would be cool.
Silver can 540's (as Jimmy suggested).
Schumacher Yellow full spikes (last ages).
Cars should be as original as possible.
I know Simon Majors got some vintage cars. Jim mentioned an old Yoke with trailing arms!
I've got a Tekin 410K (the keypad one) that would look well cool in a gold tub RC10!
Yeah Jimmy, its got the 6 gear tranny. Are they the new ones?