www.tamiyausa.com have a page for most of their cars with a PDF of part numbers, contact a Model shop and try ordering the part number direct.

http://www.tamiyaclub.com/ Is a site with lots of obsessed Tamiya fans on it (the sort of guys who have two of every kit, one for running and one NIB (new In Box)) - if no one there can help then you are doomed - but I think they have a parts shop on the site that should help.

It is based on the Mad Fighter buggy, so try looking for mad fighter parts - apart from the shell and the wheels they are identical...

I have a Mad Bull, it was my first "Propper RC". They are good fun - but wait till you move onto a race ready one! - I got a Yokomo Mr4BC after the Madbull and the handeling was unbeleivable in comparison!

Good luck

Ahab.