When I was looking for an upgrade I was searching on here and saw someone posting about peugeot 406 brembo calipers fitted easily with Clio 280mm discs.
I bought a set of 406 Brembos and 280mm clio discs.
A machine shop milled me out some brackets but he said for the best fitment he milled a small bit off the hub too, just to make them perfect. He said he has made conversions before and this was not a very straight forward conversion compared to others. I don't have them fitted yet as I needed the car back so he fitted the original brakes back on.
The pads have a 1mm overhang on the disc too but that is so small it wont make any difference really.
So anybody looking for Brembo brakes, the 406 Brembos do fit but not a simple fit, however once you get the custom brackets made you don't need any disc spacers or anything.
The machine shop charged me €200 for the brackets.