I bought the Mustang seat from Oneida Suzuki for $414.68 which included the shipping to me. I got the plain and not the studded. The link is
MUSTANG 2 PIECE SEATS M50 2005-08 BOULEVARD :: Seats :: Boulevard M50 :: Cruisers :: Oneida Suzuki Inc
I ordered it on the 10th, and put it on the bike yesterday when it came.
I rode it 135 miles today and it was head and shoulders above the stock unit. My only complaints is that it pushes you ahead about 2 inches and I am tall, so I will be looking for forward controls to stretch my legs out, and it put my arms in a new position which seemed to fatigue them sooner.
Butt felt great though as it cradled it and made it a lot easier to go over the speed bumps here on the Pennsylvania highways. Some of those 65 mph. bumps on the stock seat almost threw me off.