cmng-it's the same caliper used in some of the Godspeed brake kits.The Austin Metro GTi also had 4 pot AP calipers as did the Austin Princess :lol: .
Mark,it's not that simple
.You need to fabricate a spacer bracket that has the R's 130mm hole centres and reduces to the Brembo/ZX calipers 100mm whilst also moving the caliper away from the hub to accomodate larger discs.However,the offset of the caliper may be different so it might not just be a flat spacer,but stepped.
Also the discs will most likely have a different offset and be thicker than the R's so that also needs to be taken into consideration for the caliper offset.
A bodgit way round it is to have a flat spacer and use washers to get the right offset but if you use too many then it will flex on braking.