I just fitted a pair of callipers from ebay by KV distributors £135 for the pair and they are super quality , hard to believe I know at that price , I was shocked by how good they were , My brothers mates advised him to tell me . fitting them is 15 mins a side very easy job . but takes some pumping the pedal right down to the floor to bleed after it firms up with the electric pump instead of normal sevo . original callipers seem to be a weak point on 120s . I changed the brake fluid back to dot 3 as I changed the fluid about 12 months ago to dot4 , and I have herd dot4 is bad for the piston seals in the original callipers . and I think it could be why my front callipers started sticking , the breaking now has been transformed with the new callipers .