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.
All cars have 18mm except: early S1 with plungers, 1.3S (with remote servo in front LH wing) and GTE which all have 19mm.
