I bought them in ls1tech 2 sets of Hella 60mm projectors and adaptor plates - LS1TECH. He got them from some other member who made the plates. It looks like more than one person make these and they sell for around $100 plus shipping. It's a just a pair of Hella projector headlights and adapter plates. It shouldn't be so hard to make these on your own.
http://i43.photobucket.com/albums/e3...ps42474f8e.jpg
edit:
found them on ebay:
Hella 60mm Projector Adapter Plate Trans Am HID 1998 2002 | eBay