Experimental Rear brake setup.

Using a SZR660 foot rest (Brembo pump)

Using a TZR125 4DL caliper carrier (brembo caliper)
(needed to enlarge the axle diameter to fit 3MA axle)

The construction of the 4DL carrier is different compare with the 3MA.
A 4DL Carrier is holing in place by a notch. (so this needs to be made)

Simple and effective, a plug that fits the original SP swingarm and holds the carrier.

With a locking bold to prevent it from coming lose

Using the original hole that is already there (in a SP swingarm)