The backrest is a must for me and it should help tremendously for him doing long rides.
If he doesn't want it it just slide out, nothing to undo to remove it.

I think Mustang makes a Low seat now too. http://www.mustangseats.com/Category/LowDown-Touring

 

I put on the Mustang Wide Touring with the backrest and love it. Can do several hours on it and not have a sore butt. Had a similar seat on a Kaw Nomad and it was great also. I had originally put on the Mustang Lowdown, and while it did get me comfortably lower, the comfort is missing. It has a new owner in CA now.

 

The Mustang is the most comfortable motorcycle seat
I've run across. I've tried most of em.

 

If it were my wife, she'd see if they had a gift certificate she could get for me and let me pick out the seat I wanted. Something like that is best left to the user to select.

 

Liz, I have a Mustang on my 06 and I had one on the Heritage but I swapped it for an Ultimate. Hands down best seat my tush has touched.

 

He sat on it at sturgis and loved it. I just want to make sure that people felt like people still feel that way after a while.

 

Oh I see. Good on you for thinking of him.

 

We need more women like you!!!!

 

I think he'll really like it. I have the studded touring version on my 08 RG. I can't remember what it's called exactly. But I think they called it the ultra touring seat. The seat itself is very comfortable when combined with a backrest for all day riding. But if I had it to do over again I think I'd go with the sport version. It might not matter on his RK because it's pre 08, but when they went to the 6 gallon tank it also made the snout of the seat a little more wide. I'm 6' on the nose and I can flat foot at a stop without any problems but it occasionally gives me a little hip discomfort from the wide stance. I seem to remember seeing a pre 08 version of my seat on another RG once at J & P and if I remember right it was a little more narrow at the nose of the seat. I bet he'll love it! (just be ready to buy him a backrest too!!!)

 

I realize it's a different seat but I have the mustang lowdown and have never been so happy with a seat on both of my harleys. I'm on the 2010 Roadglide and I'm 5'7 also and it works perfect for me. I bought it and without testing it rode to Milwaukee and back with great comfort. It still seems to be getting better with a few more thousand miles on it.

I wouldn't hesitate to buy another Mustang