[joyridin']

On the other Cobra site, there is a thread where somebody installed 6 pot calipers on the front and 4 pot on the rear from Gordon Levy. The rear would be good for you, but you may have to modify the front a bit since you have a M2 front suspension.

Have you ever thought about finding an IRS unit from a Mustang Cobra and installing it in place of the solid rear axle? You can find the 28 spline pretty cheap and it would give you IRS.