Hey Mark, thanks for the details!
The Curt T-Connector # C56217 is actually designed for a Toyota Highlander or a newer model RX350 L which is one reason you're struggling to find the right connector on your 2019 Lexus RX350 L.
Since your Lexus doesn't have the tow package the only Curt 4-Way kit that works for your application is the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector # C59236. This splices into your OEM wiring and then is powered directly by the battery... view full answer...
Per Curt their Trailer Hitch Receiver # C13272 will not fit the F-Sport package on your 2017 Lexus RX 350. While we have had a number of reviews come back to us saying they were able to bolt it right up without issue there are other issues some have ran into where it would not fit their particular vehicle. The best I can say is you can see the installation video I have linked near the bottom of the page. If you see our particular Lexus has any components in the way of where the receiver... view full answer...
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