Im not sure if this is the best place to ask about info on these extensions, but here it is.
Do I understand correctly that all they do is move the floorboards out away from the frame?
If I am already dragging boards from time to time on my 08 streetglide, will I hate having these?
Yes Sir you do understand correctly, these do move your brackets away from the frame.
The rule is that if you scrape now you are still gonna scrape. If you don't then these will increase your risk of scraping by an insignificant amount. The loss of lean angle for your year and model is less than 1 degree.
Do keep in mind that your purchase comes with a 100% money back guarantee. Install them, love them or I will pay the return shipping and give you back every cent you paid.
I hope this helps you.
Be safe,
Tom
HarleyGoodies
626-253-2022