I'll do some measuring tonight when I get in from work.
I will tell you that it's not a BMW master cylinder as far as I can tell, as I purchased it from Marlin. It's also mounted to the Metro servo without a mounting plate / adaptor, so the stud dimensions / pcd is as per the metro part.
I don't think it matter too much about the degree of rotation. What it is at the moment is as it fell from mounting the servo in the best degree of rotation to allow easy rounting of the vac hose and to keep the low pressure fluid entry ports relatively topside.
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