You are right about the 1st & 2nd gen options, the '89-91 trucks had the ptions I listed, atleast according to the brochure at the time I bought my '90. The '91 I have had the same package as my '90 except for the tow package(drop hitch/wiring harness).

A 3rd gen X-cab w/bench seat, did you buy it new or used that way? A bench seat would make the rear seats useless, even for kids.

I imagine options could have also varied by region, both of mine are CA models.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed