Hi,
Looks like a Sherpa based servo, as far as i can remeber the SD1 does not have the 2 studs above the master cylinder where as a Sherpa does.
The SD1 also had brake fluid level sensor built into a larger cap on the resivior.Also could be wrong [:I] but the brake pipes on a SD1 master cylinder exit on the other side to the one shown but not 100% sure [?]
Cheers John.
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