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You can buy a used led fog lamp unit on eBay for $20 including shipping:
Here is a listing for a RX fog lamp, same one used in the gs, you can easily pick the screw/grommet off that. https://www.ebay.com/itm/293170519941
The ES, GS, and RX use the same fog lamps.
Otherwise Lexus does not sell it separately you would have to buy a new one.