Hehe...
Having the same wheel specs as the Z's won't help too much, though. I used to be a big fan of the 240Z's, wanted one to restore, till they became classics and thus expensive. I'd still like one. Anyway, I don't remember there being a huge selection of wheels for the Z's. I've seen a fair number of Z's with Panasports, and alot of Z's have American Racing wheels that were common dealer options back in the '70s. (240Z's came with ugly wheel covers)
With Panasports:
http://www.cardomain.com/memberpage/626930With the American Racing Wheels:
http://www.cardomain.com/memberpage/650770Personally, while I like both on a Z, I don't think i'd like either on a Celica. I've seen other aftermarket wheels on Z's, but those are the only one's i've seen alot of. Still, the Z community is probably a good place to look for used wheels.
Our wheel size was also used on the '82-'92 Lotus Excel. Lotus was dipping heavy into the Toyota parts bin at that time, and giving Toyota engineering help in return. I've heard that they did some suspension tuning on the Mk2 Supra, and it's rumored they did ALOT of the development of the Mk1 MR2. Anyway, the Excel used a W58, the brakes and some other bits from the Celica GTS and Supra.
I've seen a few Excel's with wheels similar to the ones that 85BlackGT has on his Celica, but Lotus only built about 1300 Excels, so obviously, those wheels would be extremely rare and expensive, assuming they are a factory option and not aftermarket.