Mark-some are 60/40 & others are 40/20/40. I have a set of the '40's in my '55 Bel Air. They are 22" at the widest areas. Leaves me some room for the trans. tunnel & floor shifter, may make an oak catch-all for the center someday. Mine are from a '01 Silverado, non-power. By drilling out the rivets on the OEM mounts you can attach the tracks directly to your floor & get them nice & low. The track gives you 10" of slide. Look under a OEM set at the floorpan & I would put no less than a full rocker to rocker floor stiffener to mount them to. Doug
