Hey sorry fellas If my post was confusing and misleading. The set up I have is this:
66 GMC with front bench and one back seat. Also has, as oem4me pointed out,
one Lh & one Rh slider window for the back seat and a set of fixed windows at the far rear. The carryall has the factory tracks from the rear seat back to the clamshell
gate. My question is and sorry I was inept the first time, would it be possible to
convert the carryall to a three seat configuration with installing a slider set in the far rear and moving the back seat to where the third seat is normally located. I would need to locate the standard, shorter width middle seat and a set of sliders. Again,
sorry to be confusing and thanks for the patience!