Since its such a custom bumper, I believe only the Esprit lip will fit "perfectly" on the Esprit conversion bumper:
https://www.modinjapan.com/esprit-fr...nt-bumper.html
https://www.topendmotorsports.com/le...umper-5342.php

You may be able to find something that is cheaper and also fits that bumper.

eBay bumper: Here is that post recently where another member confirmed good fitment for the price on that eBay bumper: https://www.clublexus.com/forums/gs-...l#post11040818