The RDL on my F6B is 4" up & 3" back, custom made to fit my 6'5" 400# frame and 36" inseam. RDL can build it to go back 1" more and that is it for the F6B seat pan, my first one was the max 4" back, but I had it redone to 3" back and I doubt you will need that much. I also run the 3/4" drop mounts with the kinetic pegs and Ergo lll forwards all from Kury and HeliBars. My Runes have a 6" lift over stock and 3" back to them.
Here is link to more pic. http://hondaf6b.com/showthread.php?5...Daylong-Saddle