Yes - they are alum. PBR twin piston calipers (an Australian manufacturer derived from Brabbam's old company Repco). Anyway you will have to grind down the caliper casing on one side (passenger I recall) to accept the stock banjo bolt. I did mine last year and got 'salvaged' calipers (with pads, frames & hardware ) from crashed Mustangs, sold by "mustangparts.com" for $100 set. If you get then from Ford, even with discount it's gonna be atleast $300+ - as you need the calipers, caliper brackets, pads & clips (not all pads come with the clips). There used to be a very good article on the TCCOA site about the installation.