we had an older ultra with the longer arm rests, our new 08 classic wasn't as comfortable with the shorter rests. The Mustang made everything fall into place with our Hammock seat. Now a long days ride does not wear us out and we feel better at the end of the day. The styling also fits well with our seat choice and the installation was a breeze. I highly recommend this backrest if have any type of back trouble, it allows you to move around and relieve the pressure on the lower back.