you can get the odd 22b wheel off ebay in the uk. Personally i would just put on some volks and aftermarket suspension. the original 22b suspension is a heavy duty version made by bilstein under prodrive name. it rides firm and suits tight track work with a bit off give.
all other parts you can source off a v4-5 coupe apart from the front bumper, front guard and i would just get the rear guard hand panel beated.
Its not worth replacing the rear guard and bbs wheels just to dam expensive.