rims, you can get from the maufacturers website. enkei.com motegiracing.com volk.com
fenders and stuff i would think like proautoparts.com and stuff for regular parts. and of course theres google and ebay. thats just the net, you can order them from mags like super street, sport compact, honda tuner, or from a shop, classifeids, or people selling stuff on this very site.