Is that seat made on the stock F model seat base, if it is I may be interested...? How much clearance is there between the chain and rear tire....?
Retro,
Yes, that seat is entirely stock. I'd be more than happy to part with it as well 
As for the chain question, I haven't put the chain on yet because I haven't been able to get the front sprocket cover off..Those screws are really corroded in there and I didn't have the time to go out and buy an impact screwdriver. When I get the offset front sprocket on there I'll measure and let you know!
Hey Foil, you never returned my PM's on that "god awful seat", I still need an F model seat, mainly for the seat base, do you intend selling it or not ?, we got to the money stage, I even gave you an address to post too, then you never returned my messages....?