08866-04 is an optional lowering kit for part numbers:  FKS 226 and FKS 228.  If you would like to drop your front end by one inch, then please purchase this kit in addition to the FKS 226 or FKS 228 cartridge kit made for your Harley.  This kit includes fork springs.

Lowering kits also available for our FKC 101 and FKC 102 cartridge kits. 
If you would like to add a lowering kit to your FKC 101, please add part number: 08865-01. 
If you would like to add a lowering kit to your FKC 102, please add part number: 08866-03.