on LHD cars it was an option but its done with a massive master cyl assembly and dosent go on RHD tho
still it is not that hard to do, only converted the 1 to ABS but basicly pulled the pump and associated wireing from an old A4 ( it was an experiment and it was there ) ecu for it's on the pump and not to hard to wire up.
you can get the sensors ect and rings to fit mk2 hubs so it pritty much bolt / pipe up. pump nests on the ns chassi leg quite nicely
