Yes, all seats interchangeable.
The IS gas tank is a little larger than the std/Tourer, so their seats get a little squished when on the IS.
I think someone said the Mustang is the only seat that has a different aftermarket seat for the IS and the std/Tourer.
I never liked the fit for me of the Corbin, only tried it for a week. Yet a local rider has had it for 15 years on his IS.
No sir. Mustang is the
only co making seats for valks that does
not sell different sizes for interstate vs std/tourer.