where can i get some bits for me calipers
 

i have 928 s4 calipers
-i want to fit the 322 pads from the gts
-is that ok to do?

-then i need the 2 clips that hold the pads -where would i get them?

-plus i need a set of dust seals?

-then 4 m12 by 1.5 90mm socket head bolts, threads 40mm

oh i also need a small piston

-????????????????????? -preferably in london?

Sounds like a parts yard find to me. for the seals, go original and source them from a dealer.