which model benz does it come from?
or...?

From another thread last week. There is MB model info there but I haven't verified it.

http://www.914world.com/bbs2/index.php?showtopic=103193

From that post the part numbers are...
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Unless these have been superseded, I used these numbers for my 23mm master cylinder.

The (Mercedes Benz) Part number is 022.430.9301
The ATE part number is 03.2123-3402.3

You'll need the "blue" hose and 90 degree inlet pieces unless you already have them.

Note: I had to relieve (grind off) a little of the dimpled end to get it to fit behind the rack .
Not a problem and it's been in use for ~12 years. I have Wilwoods also.
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FYI SmartRacingProducts has a kit for the 911 but have all the bits to make it a 914 thing. I'd bet they're familiar with our application.

http://www.smartracingproducts.com/pdfcat/...heelsbrakes.pdf

Good Luck