I think the full buckets were only available on SR5 models, I know even 3rd gens.(in '90) when I bought my X-cab only the SR5 models had full buckets and the DX's had the 60/40 split bucket seats. I really wanted full buckets, but the extra $1500 for the SR5 package(included cruise control) and the added insurance premium cost made the buckets less desirable.

The bucket back bench seats are really a nice fit for the std. cabs, you get the support of buckets and the leg room of a bench.
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I don't know if they were even offered other than the 2nd gen rigs, I haven't seen any in 3rd gens or Taco's.

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