If I could make one suggestion (the piece looks really nice, but out of my price range for what it does):
Perhaps have different levels of pricing, for instance
a. Full adapter kit with adapter, nuts, bolts, anodizing, etc
b. Full kit w/out anodizing
c. Just the adapter (anodized)
d. Just the adapter (non-anodized)
I don't know if it's possible to just have the adapter non-anodized, but I'm sure it'd cut down your costs and allow you to sell them a little cheaper for the cheap-skates on here (including me

)