I did lower shocks and shorter front fork springs.
Have look: http://www.greatbaymotorcycles.com/catalog/catalog2.asp?id=BAM&search=&curpage=3

Part #: 1564BAM
America and Speedmaster Fork Lowering Kit Price: $99.95

Description:
Front fork lowering kit for the Bonneville America and Speedmaster. Lowers the front of the bike for that "slammed" look. Use with the rear lowering shocks for the ultimate lowered look.