An XB9 seat is 1" lower than an XB12 seat if that's to your liking - any XB year model will work. Ebay has quite a few right now if no one here pans out.
Yeah, the SCG came with the 1" Low seat (which is the XB9 seat). My point is with the exception of the SS seat, all XB seats will fit. It's a matter of preference, Regular-(XB12) or Low-(XB9) seat, from there.