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To make it match, you'll want the rear seat for the middle head rest and the trunk lid and tails. Then to be picky, the wood steering wheel and door liners which also have the wood trim. I cannot recall what the 98 had but the 99's had the wood accents in the interior. (?)
In the end, unless you have a junked 98+ ready to go and cheap, the conversion is going to be $. Given the age the practicality of this is even less. Easier to spend the extra $ for a 98+ and get the VVTi motor along with the side seat air bags.
iirc.. the 98, only the right side tilts down when in reverse. for the 99-00, they tilt down for both left or right when in reverse, depending on which side you select.