hey man, duno what your budget is for a new bumper is but theres a NOS one, still in its box, for sale in Japan at the moment here: http://page9.auctions.yahoo.co.jp/jp/auction/k161791878
theres actually a whole heap of NOS stuff on there at the moment:
http://auctions.search.yahoo.co.jp/search?p=ta22&auccat=2084005255&f=0x2&slider=0&tab_ex=commerce&ei=UTF-8&b=1
these cars a very cool, a friend of mine has a ra23 and another one used to have a ta22.
EDIT: Ive just seen your wanted ad, that links been sent to you already haha