I used the fieroaddiction one. There is a difference between it and all other kits though. The difference is that with the fieroaddiction kit you use 88 fiero calipers to go with vette rotors. All other stock parts are retained including master, lines, booster and porportioning valve.
The kit includes the rotors (drilled for fiero bolt pattern), front hubs (for 84-87, pre machined), concentric rings, caliper adapter brackets and bolts to put it together. It will work with either 84-87 or 88 fieros (or mixed for the 88 cradle swappers) but you will need to aquire calipers if you have an 84-87 car. Price is great at between 400-800 depending on year and caliper price. He also offers a drilled/slotted option for 100 extra.
85 fiero GT with 88 cradle swap.
Clearance on 16" wheel. Not tested by me, yet, but they should fit with the stock GT 15's. I will be checking clearance on them this weekend to know for sure.
Also see the LS4 DOD paddle shift thread for more pics of the drilled/slotted setup. I also have more pics and details of the install in my build thread in sig.
I have also not had the best luck with WCF. Their prices are high and service is not the best IMHO.
DS1 (Design Systems 1) is another option for 12" upgrade (using vette calipers). Good luck on your search.
------------------
84 SE auto. - a fun original
85 SE V6 4 speed - stock, fully loaded - daily driver
85 GT 4 speed -
build thread (in progress))
4.9 rebuild thread88 Coupe 5 speed - runs and drives, needs work, patiently waiting for its turn.
[This message has been edited by Fieroseverywhere (edited 02-12-2008).]