My 93 corrado 2l 16v has ATE 10.6123-0680.3 master cylinder. Various sources suggest that other VWs with ABS have compatible cylinders. Is this really so? The nearest I can find is 10.6123-0690.3 on some MK 3 golfs, but is this a completely different part/ identical/ as good as the same. Neither part can be found on the ATE online catalogue. I'm looking for hard facts please.