that suzi one is 90mm on the caliper carrier.

not sure if the xs of fz are 100mm

Sent you a pm drewpy

Youv'e mentioned about the caliper and the distance of the mounting holes for the forks, but another thing to consider is the size of the disc the caliper sits on. when I converted to take a twin pot Brembo caliper on to a 305mm Disc, I made my bracket to suit, the Brembo caliper bracket I made for the DTR forks needed 70mm spacing between holes but surely you can make your bracket to go to 100mm hole spaces?

Plus if you really want a 4 pot caliper, which in my opinion is over egging the pudding somewhat for a 125 bike, you can use an RS Aprilia 4 pot caliper using this set up

I can't make my mount 100mm there is not enough metal on the bracket

I don't want a 4 pot I want to run a 2 pot it will be lighter ( the fzr four pots that are on now weigh a tonne

An as you say 4 pots are an overkill for a 125 especially the twin setup that is fitted at the moment