I bought the seat on ebay. Do a search for "solo seat" in ebay motors...there are a 1000 of em on there. Basic style. The ride is awesome! Not only do I get the cushion from the swing arm, but I get it from the springs as well. The springs are 3 inch from ebay as well.
Good luck

Best looking black girl around! 2004 SM-spokes, solo seat, lowered rear, 14 in apes, bobber rear fender, no front fender. Flat black all the way around. Jeff