[Jac Mac]

Bill,

This was the exact problem that I had just finished solving on the TVR I used to work on when I sent you the bump Steer info .
The previous clever clogs had machined the original caliper mount lugs off the C4 upright and made a new caliper bracket that mounted on the rear face of the upright by means of the four bolts that retain the wheel brg assy, In practice this method gave trouble as the caliper mount was not in line with the caliper & deflection was causing long pedal & uneven pad wear.The new mount bracket now fitted was made from steel (0.0200") and is sandwiched between the wheel brg carrier and upright as well as having another pair of lugs to pickup on the rear face of the upright on two of the hub bolts.This bracket is rock solid and cured all of the issues we were having in this dept.

Fortunately in the process we had to change Rotor Hats as well and as these were approx 0.300" thinner at the hub face area we still reduced rather than increased the scrub radius.

Now looking at your pics & before you even start to try and fit those calipers have you checked that they are going to clear the center of the wheel with those rotor/hub assy as there does not appear to be a lot of rotor offset in relation to the hub face.

Just looked again, can the rotor not be mounted on the rear face of the rotor hat to help, you may then be able to mount the caliper on a simple stepped bracket that uses the existing upright lugs with the caliper slightly higher ( caliper lugs straddling the upper lug of the upright.)

Jac Mac