I have a short sissy bar on my 2011 Street Glide. I am looking for a little taller version for those longer rides. My understanding 2009 and later detachable Harley will fit. I have found new for $149, I'm looking to spend $100 + shipping.

 

Can't help you out with the backrest bar, but can confirm the part number you listed is what you want.

I had the short one on my Street Glide also, and purchased the standard height one.
Much more comfortable for the wife. You'll be able to use your current backrest pad on the new one.

Oh, I ordered the new backrest from Zanotti's.