S2 21mm master cylinder suits all S2 and S3 models. They bolt to the bulkhead mounted servo.
S1 master cylinders are only supplied for LHD cars. For RHD cars you will also need the LHD-RHD adaptor. The pushrod will need lengthening to suit, which we can do for you if you send us your pedal pushrod, or they can now be supplied new.
All s1 cars have 18mm except the following which use 19mm:
