cobra brake question
 

I was wondering if the 1993 cobra had 4 lug bolt pattern, I believe they do. And based on that.. I was wondering if it would be a good idea to just upgrade my brakes to 1993 cobra brakes...with factory equipment.. spindles..rotors(even though i do want slotted and/or corssdrilled).. calipers(is there a better source for these) .. and steel braided line.. I cant seem to find any reasonably price up grade for 4 bolt mustangs and my 83 brakes just arent up to snuff..
Wondering if my 17"x8" chrome cobra R's(+12mm, 4.95" backspace) would still fit? Anyone know the reason why wheels wont fit a 1993 cobra? Thanks in advance..