Hi Q, If you clicked on the parts page, scroll down farther. They have front disc plates too.
Here's a description from their eBay ad:
"These precision laser-cut brackets use your existing stock front drum spindles to convert to disc brakes. No machining of your drum spindle is necessary; you do not even need to remove it from the vehicle. We use GM metric calipers and 4WD S-10 rotors (10-1/2", same as original disc) to accomplish this. You will need to machine down the drum hub diameter, and do some minor reworking of the metric caliper. Done properly, you can convert to disc for less than $300. Please measure your spindle to steering arm bolts; I must know whether you have 1/2" or 7/16" bolts."
Sounds cool, eh?
2nd question, if this is a reasonable conversion, and if my Firebird is 99% original, SHOULD I modify it?