I think the long box wheelbase is the same as a CC. The longbox was only offered with a standard cab. I am fairly certain they only had the two chassis to work with. I'll drag out my 92 FSM and see if there is anything mentioned in it. I think they still offered a long box in 92.
Yeah, the Standard Cab w/ Long box has the same wheel base as the ClubCab w/ short box, 131", same chasis. The standard cab w/ short box has a much shorter wheel base, somewhere in the neighborhood of 107" ?