Brakes have me baffled!

If it makes any difference, here's the master cylinder I've got:

http://www.magnumhp.com/showdetails.php?ITEM=MAG-1

It's an aluminum unit with a 1-1/16" bore.

One other thing - I had to use a 4 to 2 bolt adapter (this one: http://www.magnumhp.com/are-02.jpg ). Is it possible that my pushrod is too short now?