Can you identify this master cylinder?

[Tahoe]

This dual master is in my S2. The only markings I could find are 3/4 for the bore, and stamped on the end it says GT1. Any one know this master? It looks very familiar, but can't seem to find it anywhere.

[Old English White]

This dual master is in my S2. The only markings I could find are 3/4 for the bore, and stamped on the end it says GT1. Any one know this master? It looks very familiar, but can't seem to find it anywhere.

Similar to some often seen on Cat's ... But in that case without the plastic twin reservoir .
Clever mod btw ... That should increase the efficiency , no !?!
Christian.

[types26/36]

Maybe Datsun/Nissan???
http://www.google.co.uk/imgres?imgurl=h ... hQevl_SKCg

[Tahoe]

Maybe Datsun/Nissan???
http://www.google.co.uk/imgres?imgurl=h ... hQevl_SKCg

That's it. I just Googled Datsun parts and found it in a few places. I like the way it fits, etc. but with a 3/4 bore the brakes are a bit hard.

[Galwaylotus]

This is what I used. 0.7-inch bore. AP brake master Cyl.

[Tahoe]

This is what I used. 0.7-inch bore. AP brake master Cyl.

Thanks, I'll look into that one.