Drivers seat backrest question

[boss hoss bill]

I recently picked up a Ultimate Seats King Big boy drivers seat.

I want a backrest for it, and besides the one from Ultimate, does anyone know of any other brand that fits it, and your opinion of it if you have one?  If anyone has one for sale, please PM me as well.

TIA

Bill

[Chrisj CMA]

Mustang fit mine, I tired a friends backrest to see if I liked it, I didnt, saved me $$

[Mean Cat]

Utopia

[boss hoss bill]

Thanks for the responses so far.

I need to clarify; the King Big Boy does NOT have the slot in the seat itself. 
(I already have a Ultimate Big Boy seat with the backrest that slides into the seat, I need more room, that's why I bought the bigger King Big Boy.)
The backrest the King uses bolts to the fender underneath the seat. This is the type of backrest I am looking for and need for this particular seat.

[Ricky-D]

There have ben past reports about the driver backrests that attach to the rear fender

tearing up the fender.  Judge accordingly.

***

[Tailgate Tommy]

Utopia

+1 Works great for me.

[Tailgate Tommy]

Utopia

+1 Works great for me.

Ultimate Big Boy with a Utopia back rest on my IS.

[John Schmidt]

I've had a Utopia on my bike since the King Boy came out, quite a few years now. The picture that shows with my posts isn't with the King mounted, the attached picture is. This one is softer so I use it for traveling. As you can see, I had it covered to match the cover on the King.

[blackvalkyrie]

I have the Utopia on my 97 standard, with the pass seat removed...and stock driver seat..bolts right into the fender no problem...plus it's adjustable and folds down

I recently picked up a Ultimate Seats King Big boy drivers seat.

I want a backrest for it, and besides the one from Ultimate, does anyone know of any other brand that fits it, and your opinion of it if you have one?  If anyone has one for sale, please PM me as well.

TIA

Bill