Cobra calipers or the stock GT PBR's. Either will work but depending on what year spindle you have, you may need to grind them a bit to get the pbr caliper to fit.
Yes they will fit. You will have to clearance the spindle for the GT/V6 calipers as stated above. The cobras will fit as is. Make sure you get the correct brake lines. They changed the thread pattern in mid-03.
does that mean i have to get two different thread patterns? if i get mid 03 calipers then they wont mate up to my 89. am i understanding this correctly? thanks for the help