back to original !? help needed

[freezmcnally]

perhaps the gurus out there can help me
how can I find out what original bench cover and door panels my truck would have had. it has no spid and previous owner passed away, so no info.
it has chrome trim all around with eyebrows etc
'custom' badges on door sill
i have a 68 long bed (wood)
15" baby moons
drum brakes
power steering
coil springs on rear.
1/2 ton
no air.
chrome windshield and side vent trim
blk trim on rear window