89-92 extended cab rails will swap in for sure (there was a change-up in 93 putting an extra hump in the floor. You can extract a hump from a 93 onward and weld it in if you want to mount newer seats - apparently up to 97 anyway - I did this on my 91)
Pretty sure 88 and older extended cab rails will work, too, if you can find them in decent shape. But def 89-92.
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