Installed new Pintle Hitch today. It is a pretty straight forward project.
Bear in mind that the Pintle hitch is made by Toyota for use on the Toyota SUV as well as the Lexus GX470.
Therefore, the Lexus hitch part # 5190935011 is exactly the same part # through the Toyota parts dealer for about $60 less than through Sewell with the Club Lexus discount ! I paid $173.38 through Toyota of Orlando with free shipping. Search the part # thru ebay and you will see their auction post for that price or email them direct at email@example.com
Best price ($70.81) for the plastic cover part # 52169-60051-A0 Cover (Pearl)
that has the cut out for the square receiver clearance is through Sewell at the Club Lexus discount. This part is not on the Toyota truck so you must purchase through Sewell Lexus parts. The letters at the end of the part # designate the paint color, so be sure to select the right one when ordering. You must use this new cover to properly trim out he plastic around the hitch as the old one will not fit unless you saw out a square section at the bottom to clear the square hitch.
The 6 bolts to hold this hitch on are already under your GX470 holding a square plate which you will be removing when you go to install the hitch.
The 4 Blue plastic retaining clips on the inside of the cover must be removed to be able to remove the existing cover. You have to push a tab down on the blue clip to slide it out of the slot. The tabs are in a very tight position and are sometimes brittle from age & heat and may break off while removing. If you need replacement ones, or if you just want a few spares for reassembly, you can order them with your plastic cover from Sewell. The Lexus part # is 75392-35200.
This setup looks very neat and clean. 100 times better appearance over the bulky bar underneath type hitch. The rating of this hitch actually exceeds the tow capacity of the GX470, so no worries.