yo Ted!
Welcome!
Here ya go;
Rebuilding Kit; Bucket Kit for 80-96; includes (2) 24" x 24" Foam Sheets; (2) 18" x 20" Reinforce Material, Pair of Hog Ring Pliers, Package of Hog Rings & Instructions Source: by lmctruck.com No thickness, but some have said in past it is 1" thick; call them, they are a ok
Tips & Rebuild in an 86 Eddie Bauer; "....It gets rid of the toilet feel they get as they age (your @$$ touches the sides, but not the middle). for next to nuthin' and they feel great now. All it cost me was a box full of hog rings and a pair of hog ring pliers, some 1" foam and the special non-melting spray can of foam rubber adhesive. Cut the hog rings and remove the seat bottom covers. Cut the center piece for foam, then the side bolsters, spray them and the original seat foam, wait 4 minutes and stick em on. After that pull the covers back over and install the new hog rings.While you're in there, tighten all bolts, especially the floor and track to seat bolts. I did this not just cause' Iz cheap, but also because precious few other seats out there are as large or have armrests. Dirt cheap, damned easy and darned effective..."
Source: by Sixlitre (Malcolm H, Eddie Bauer) - He has vg info! altho it is an 86; it is prob similar.
Also basing 1" thickness on;
NEWARK SEAT PADDINGS; Seat Padding
Brand: Newark Auto Products
Part#: 5001
Foam 1" Thick, Moldproof, nonallergenic polyfoam trims Fits easily to all bench and bucket seats (24"W x 60"L) Extra comfort for all seats and backrests Use where seat springs are weakened or old padding is badly damaged. More $35.99 Each
I punched in 1996 Bronco for this at Newark's site; apparently they see direct, but mostly via JC Whitney.
GL!