POSER

if you have a bench and want to swap in some 99 bucket seats.... dont bother....
tacoma seats suck so much fucking ass....ihate mine to all hell....they suck suck suck
i would save up the dough for some nice corbeau seats..
or do what i am going to do soon...swap in some celica, 4runner or volvo seats
leather, adjustable, posh seat.... they fit nicely with some easy mods...
to answer your question.....the 99's will fit.....but you might need new bolts...as the bench seats might have different ones..i do not know...
forget the 99's in my opinion though
if your going to upgrade..get some worth it