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I can tell you that I have a '95 Ultra and I now run a '96 Road King (Mustang Solo) seat. No biggie there, but I've become interested in get a newer seat. So... I took my coworker 2002 Road King seat of and slipped it on mine bike. Guess what, it will fit easily. No strange angles or curvature. I also noticed that my seat will fit on his later model bike. It does require one of two modifications, though.
1 - remove the front tab from the late model seat and fabricate a small "loop" and rivet it on. This is the same type of "loop" bracket that my Mustang Solo uses.
2 - Cut a slot in the top of the frame, just behind the fuel tank, just like the later model bikes have.
Personally, I'm going to cut a slot in the frame. That way I can try out plenty of different seats.
Funny thing about using different year model parts. Try it, you'll be suprised what will fit. Sometimes it might require a minor modification, sometimes none at all. Here's some of what I've done, that Harley says will not work.
On my '95 Ultra:
'96 Road King Mustang solo - no modification
'04 Road King mufflers - no modification
'07 Road Glide saddlebag supports - no modification
'07 Street Glide fuel tank console and door - remove insert, drill small countersunk hole, install screw, install new leather insert
On my wife's '09 Deluxe:
Windshield off an '05 Fatboy - no modification
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