NaturalBreather,
Let me know if you are successful, and if you are and want to make a second bracket, consider an asking price: obviously the type of blower determines the bracket.
I have done some research, as I am sure you have. It appears there are three basic types; 1) The traditional Roots-type produces a constant pressure at all blower speeds; 2) The Twin-screw, which is also a positive displacement type similar to Roots, but uses (as you might guess) twin screws instead of lobed rotors to compress air; and 3) The Centrifugal, which appears to be the most popular for fuel injected engines, producing pressure proportional to blower rpm. There are a lot of manufacturers, and one may have a bracket that "almost" fits. You might try Accessible Technologies, B&M, Nelson, Paxton, Eaton, or Vortech which you mentioned, amongst others. Good luck, and Happy 2002.