RB5 SP2 Spare parts to keep stocked

[slow coach]

Ok fellas just got hold of a fairly good nick RB5 SP2 want to know whats the best stuff to have in the parts box and what if anything needs upgrading.

Also whats a good starting point set up wise for Dirt tracks bit bumpy a couple of medium sized jumps and a bit loose on top.

last question wheres the best place for RB5 spares in the UK or anywhere for that matter but UK first choice.

Cheers Jason