This is a question in search of information. I actually have an XR4Ti and happen to be doing a '99 GT front caliper swap with SVT Contour rotors. When I picked up a set of used calipers, I found that one piston was cracked. Rather then use it, I was hoping for a junkyard replacement that will fit right in rather then scour the net for an obscure part. Are the same size pistons used on anything else easier to source like a pre '99 mustang, a Crown Vic, Taurus, Thunderbird, etc?