Does anyone know what years the 911 19mm brake master cylinder interchanges with the 17mm 914 unit?

Sometime time back I bought a 911 MC from someone online. I finally get around to upgrading the brakes and I find the one I bought does not interchange (at least not without a lot of work). The unit I bought is an ATE MC, but it is significantly longer, has 4 outlet instead of 2, no switch outlet, and the inlets are much farther apart. I figured I bought some later model unit, not knowing what I was looking for.

I would appreciate any insights.
Thanks,
dt

According to this eBay auction, you'll need a 69-76 911 master. Part # 911 355 012 02.

Mihai- thanks for the feed back. I figure I just got into the wrong year model.
dt