[viking427]

Lots of threads on seats, just use the site search engine.

90's-current Chevy pickup and Dodge Ram split buckets (40/20/40) are popular for their fold-fwd backs and large console/armrest that hold alot of stuff. consider ones with removable headrests to keep a lower "period correct" appearance to the early trucks/blazers/Jimmys. Some have/had a lower middle seat cushion that lifts up for storage below also. Forward-folding seat backs allow rear seat pass's to "twist" their way into the back seat ..definetely not handicap accessible, but ok for agile folks, kids (take child seat access into consideration), dogs etc. Some 2 door extended cab (and possibly regular cab) seat backs flopped forward AND slid forward on its tracks with one lever pull. Power seat controls are tempting but a pita waiting for them to move fwd each time someone wants in/out from back seat. Of coarse all these need mounting modifications to fit the Blazer floorpan.

Or you can keep the oem (hinged) pass seat and replace the original console with a middle console/seat from above newer trucks. Or you can use a buddy buckets and swap (modify) the center seat's rear hinge out for one from above trucks so it stays upright & doesn't flop all the way backward ..the options are endless with an angle grinder, welder and drill.

Simplest would be to just recover a console/center seat from a newer truck to match your original buckets - giving 5th seat position, plenty of storage, Ipod/12v hookups, underseat hideaway stash box etc.