i have Captainfabs rear disc brake conversion brackets that use the 94-96 Impala SS rear disc brakes, here's the post:
http://www.67-72chevytrucks.com/vboa...d.php?t=339280
i have his brackets new in the box and a used set of impala SS calipers that you would use as cores (most places charge around $70 just for cores)
sell complete for $90 shipped
comes with all the part numbers needed to finish, ie rotors, brackets, pads, etc..
paypal preferred, but would take postal money order if necessary
his brackets are second to none for workmanship