Welcome. Can't advise on a passenger seat but the one on the Signature Series seat that I have is extra everything fursur!

 

Welcome from northern rural NY. My Slim is solo, but I have seen several pictures of Slims with passenger pillions on this site. Explore the site and you will probably find something likable. Enjoy the bike, its a fine ride!

 

Howzit and Welcome from Houston and a Displaced Cut N Shoot Texan

Haole

 

Lol well that title narrows it down to everywhere except nyc and long island.

 

Welcome to the forums.
Seat interest, comfort for the passenger, huh? You bought the wrong model for passenger comfort my friend, but, you're not alone...lol
Look at C&C's seats, call them up, ask for Chuck. My two cents, forget the pillion and go for one of his two up seats.

 

Riverhead?

 

Welcome also from the northern (Thousand Islands) area of NY. Of course it's all a personal preference, but my vote is for something aftermarket for comfort for the both of you.
My 2001 Road King and 2002 Fat Boy both have Mustang seats. Not a low budget way out to be sure, but very comfortable.
I had a Corbin on the 2014 Street Glide that I just got rid of. Firmer and not quite as comfortable as the Mustang, but overall a good seat. Seats are one of those things that are very subjective. What works for me or any other folks who may post here might not be the answer for you. Sometimes it's just a trial and error thing.
Fortunately for me, my wife rides her own. So passenger comfort is not a worry for me. But she did ride a lot of passenger miles on the Mustang of my 2002 Fat Boy and was very happy with it.

 

Found one that works with the stock seat http://www.solomotoparts.com/Le-Pera...for-FLS-11-13/ just put it on my "17 FLS and it's perfect

 

Welcome from the lower Hudson Valley.