I now have kits available that economically mount 94-04 COBRA PBR calipers and 13" rotors on Mustang II spindles, utilizing a vintage Mustang drum hub. This kit does not change track width and locates the wheel in the stock position.
Bracket kits are $259 plus $11.65 shipping in USA. Includes pair of brackets, bolts and custom rotor centering rings. Will work on stock Mustang II or lowered Mustang II spindles.
You will also need from other sources:
Cobra calipers
13" rotors
hoses
pads
A12 & A13 bearings & seal
65-73 Mustang or similar Ford drum hub
Total cost for this swap is under $1,000
email for details or check out my ebay store MustangSteve Performance.
mustangsteve66@yahoo.com