I think you are referring the 84-87 12" kit which used 88 fiero calipers that was offered by bmwguru.
That kit was originally developed by fieroaddiction. Bmwguru used to have a like to fieroaddictions installation instructions. You might be able to use the way backachine to find and old copy of it
Bmwguru installed the kit on one of his cars but I can't remember if it was his V8 or VR6 car, so you might check both threads.
[This message has been edited by fieroguru (edited 11-28-2014).]