I installed my Kuryakyn Floorboards on my 2004 Goldwing with a California Sidecar Trike conversion. Here is a link to some pictures of the modification of the mounting brackets I made to the original center bracket that are connected to the foot pegs. Hope this may help anyone trying to mount floorboards.
FLOORBOARDS INSTALLED ON CSC TRIKE pictures by ve6cw - Photobucket
:Biker: