Thanks guys.

I'm 99.9% sure the beams and arms are exactly the same.

Thanks for the advice on the supra bits, for a long while I won't be going for big power so probably no need to change. I might stick with the 2wd setup at the rear then as it's stronger and isn't different enough to worry me about being genuine as with 4wd it's genuine enough.

I'm pretty sure my old red one had a 7and a half diff in it and everyone thought that was a worthwhile mod!

Thanks again everyone.