Outdoor girl is correct. The 8" and 10" are the passenger pillions. You want to go with either a 12.5" or 15". I have a '99 and prefer the look of the 12.5". My bike is skinnier than the '04 and newer models though and if you have the wide 4.5 gallon tank I think the 15" looks better. Either one is very comfortable.

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I thought the consensus was the Sundowner was the winner for 2-up seat. If it's not, it's certainly in the top three.

For a one-piece 2-up I hold firm on the Sundowner being the best choice.

For a two-piece 2-up I agree with getting the Mustang Vintage setup. I have the standard width on the wife's and wide vintage on mine. When you are riding 2-up there are two butts on the seat so looks aren't too much a concern in my book. Form follows function when riding 2-up. Therefore I recommend getting the wider passenger pillion. Regardless of how wide your passenger is, the wider seat is ultimately more comfortable.