Are you talking about the one that you squeeze the spring loaded bracket?

 

I have a sundowner on my 05 RKC, I use the Mustang backrest.
Have tried a few others, and IMO the Mustang is the best and very comfortable.

 

I have the one that came stock on the ultra classic and it works well with my mustang seat or my harley seats. Allows for multiple positions on long rides.

 

that’s the only fixed backrest Harley sells.

 

Anyone use the HD adjustable backrest? It seems like it’s about 100.00 more.

 

I use the HD Adjustable and to me it was worth the extra $$. Different seating position, different seats, single, two up, etc... gives you more position choices when you need it.

 

What years did the Ultra Classic come stock with a rider backrest??

I use the fixed backrest and am happy with it. At the time I bought it many I knew chose the adjustable, and complained about it.
.

 

I have always been happy with the fixed mount backrest from hd.

 

The H-D fixed mount is 52587-09 for your year bike here. The adjustable is 52593-09A here. Then get the appropriate backrest pads.

I use the adjustable on my King. I like to adjust the backrest while I'm riding on long trips, especially when I go from tank-to-tank hauls. The install is quite easy and here are some pics of an install made easy. If you're one of those set-it-and-forget-it types, then the fixed might be better.

 

The HD fixed backrest will fold forward and stay horizontal, the adjustable won't. This mattered to me because my knees don't work so well any more, and I can't just kick my leg up over the seat foot first. With the fixed backrest I can fold it down and throw my leg up and over it easily.