BTW, if you have too much money laying around, Corbin will custom fit one of their seats just for you. My friend Christine did that for her Sporty, they put the new seat on her bike, then fit foam around her butt to move her position forward. Not cheap, it was about a thousand buckazoids all said and done. Took almost two months.
A note on Mustang, I got their gunfighter seat 15 years ago. The vynil finally gave out, but for about $200 they'll completey re-do it. I just have to send it in to their factory. Not a bad deal at all.