Steve,
I purchased Progressive Suspension's 412 Lowered Shocks & Fork Lowering kit from MOTORCYCLE ACCESSORY WAREHOUSE. The part #'s (for an America of Speedmaster) are:

Ord # - Description - Part #
----------------------------------------------------
35636 - PROG FORK LOWERING KIT - #101564
27928 - PROG 412 SERIES SHOCKS - #4124254C

Check out these links.....

http://www.mawonline.com/progress.htm#Fork%20lowering%20kits

and......

http://www.mawonline.com/progress.htm#Shocks

MIKE