Yea I see it didn't list the bore size. Here's a different one that is the same bore as the OE MC.
http://www.ebay.com/itm/331796848412?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
The OE MC is so different than most of what's out there to get to a more modern system that I don't see much other choice than to mount it remotely. My friend and I did talk about keeping the OE MC in place and using the pedal pivot on it and extending the pushrod through the MC back to the new MC and booster. I've seen a couple of setups like this and they seem to work just fine.
