To add a 4-way and 7-way connector to your 2019 Lexus RX 350L you are going to need two separate wiring harnesses as there isn't one available that can do both. There are no custom fit 7-way harnesses either so this is by far the best and only option.
The first harness you will need is the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package item # 56083. The custom-fit T-connector plugs into your Lexus's factory tow package wiring harness, which is located behind the rear... view full answer...
While there is not a riser, I do have the measurement above the crossbar for you of the Rhino-Rack Ski and Snowboard Carrier - Locking - 6 Pairs of Skis or 4 Boards # RR576.
The # RR576 has 3-5/8" clearance above the crossbar for your bindings, and then you can add whatever height you have from your roof to the crossbar on top of that to get the overall clearance.
As for your other question regarding the bolts, you are 100 percent correct, for a 1" tall heavy-duty crossbar, what you need... view full answer...
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