I put a new radiator in my 90 GT last month. I got it from
http://www.radiatorbarn.com
I picked up a 3 row radiator, its $145, which includes shipping. It arrived very quickly and was packaged well. I recommend using Havoline DexCool (orange) antifreeze. Lasts longer, but more importantly, cools better and eliminates "hot spots". It has the same ingredient as some antifreeze additives have, such as Water Wetter by Redline, making additives obsolete. So IMO, its well worth the extra cash.