NAGYS CUSTOMS ADAPTER RINGS UNIVERSAL KICKER RINGS
 
KICKER SOLO-BARIC 12" UNIVERSAL ADAPTER RING
 
Tons of options with this from saddle bags, trike trunks, freewheelers, tour packs etc, just shape how you want them to fit.
 
These have a depth of 2" and an over all depth of 2.5" Easily cut down to what ever depth you need 
 
Comes with mounting hardware, Hardware kit with drill bit will ship on all retail orders.