Pro Comp series 97

And ya, there are aftermarket sensors out there. Be prepared to pay through the nose though and I believe the stealership still has to program the computer to the new frequency too.
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If this might help, here is the link to a Lexus forum where they make a TPMS pipe bomb from PVC pipe and then stick the sensors in and then add compressed air.
http://www.clublexus.com/forums/showthread.php?t=328044
http://www.clublexus.com/forums/showthread.php?t=328044



Thanks to Wes, who has confirmed they do fit pro comp series 97 rims.