i put this on the general CVO page and thought since it is for a Street glide because of some differences of the ultra's, I would do it here also. Oh, Road glides to.
I decided to go with floorboards on the Street Glide. FB's are more comfortable on long trips.
My future has long legs, I love em.
So, after installing the 50378-07B FB kit she needed more leg room. I went to the shop just to see what I could do. I make custom brackets and mounts from time to time for folks.
here is what I came up with.
This is the factory mounting on the bike

This is the original height with the FB's installed.
This is with the bike on the jiffy stand.

This is the adapter in the raw. top hole is a support hole. you use the installed bolt that came with the FB kit here.
Middle hole is used to mount top FB bracket through it to the bottom hole of bike mounting point. you use a 1/2 inch longer bolt there. It will have to go through the FB bracket and the adapter.

Bottom hole is threaded to take the bottom bolt on the FB bracket.

installed on bike

The adapter adds 1/2 inch outward but it is about the same as some of us do to the Riders FB for comfort but drops the boards about 1 inch

Ended up taking around 2.5 hours to make and paint + install.
She loves em