Ok, apologies for seemingly asking a much repeated question.
Mine is a bit different though, as I have not been able to find any good intel on installing SD seats in an OBS extended cab. Lots of how-to on crew cabs.
Anyhow, specific question is can you bolt (with some mods) the SD seats onto the existing X-cab rails and still be able to operate the extended range rails, the extra range you get when you flip the seat forward.
I know I could mod the SD seats and rails to work in the X-cab, but with the new seats, you lose the extra space the original X-cab rails give you.