I looked though some catalogs at the part store & haven't been able to come up with a suitable upgrade for my 77 Monte. I found this & it looks like it is the most suited.

http://www.wilwood.com/products/master_cylinders/tandem/index.asp

Concerned about the mounting how deep it goes into the booster, can't tell with the boot on it.

What were these made for originally, I've heard Mopar's? If so what models? I'm not sure if I want Mopar parts on a Chev. :D but I'd still like to do the upgrade.

Jim