from me if you have an 09 RKC and want the one with RKC stitching...selling mine cause I use my Mustang solo all the time and for the RARE times I have a passenger...got a pillion.
Other than that, Zanotti's or Chicago Harley via their online dept.
Looking for one for a 05 Road King Custom. I'll check Chicago HD and Ebay. Would like to get the one where the stitching matches the passenger back rest. Thanks everyone for the help
Guess it depends on the year and model of your bike. I also have a "Sundowner Deep Bucket Seat - Smooth" for sale .. HD Part #51542-01B which retails for $299.95 and fits '97 - '07 Electra Glide models (except FLHX) and Road Glide models. Rider seat is 16" wide and passenger pillon is 13.5 inches wide. It's the one on my Road Glide in my signature below. If you're interested send me a private message and we'll talk about price and shipping.
I don't have one for sale but can tell you it is a comfortable seat. A member had one for sale here last year that had been worked on by Allen at Mean City Cycles, it came with a reworked passenger pillion and is very comfortable on long trips and around town. Not exactly a low profile seat, but trading off comfort for looks is more important for me.
Keep looking, they are out there at good prices, it's well worth it.