I have 2 RDL's, not on my "B" yet. Both are great saddles. Best money I've spent for comfort. In the saddle for 9 hours on my V-Strom, my butt & back were smiling when I got off, no aches or pains. I do not notice any difference in height on either of my 2 saddles. If you need height, I'm sure they can do that. It does take 500 to 700 miles for the foam to fit "your butt" after that, your butt will be smiling. Height b-4 the break in might be the "extra height" folks are talking about.
It's a small operation, one seat at a time. I suggest you call RDL with your questions, they're great to deal with. The seat is built just for your butt & your passenger. Best $$ you'll spend on comfort.