While that addresses the widths of the seat frame rails....
Its the lengths of various seats, and tanks, that has not been addressed - anywhere ??
More info in this thread already than ever before ?
Now, if we could just assemble a table of tank lengths and seat lengths.
Naaaa, we are not that organised.....
I've seen various combos of various seats and tanks with fastback tailpieces that I wouldn't have thought possible.
Its obvious that owners are pretty good at having seats etc trimmed or altered to suit...
e.g. ?
http://i.ebayimg.com/00/s/MTIwMFgxNjAw/ ... j/$_57.JPG
A post here above has probably answered how this one is possible...