The correct Westin E-Series Round Nerf Bars for a 2014 Jeep Grand Cherokee is part # 23-3610 for silver or part # 23-3615 for black. These are complete kits with both bars and the hardware needed to attach them. view full answer...
The Westin PRO TRAXX Oval Nerf Bars # 21-23560 referenced in your question does include 6 plastic bracket covers with the installation hardware. These will cover the mounting brackets used to attach the running boards to the vehicle. I have attached an image of the complete hardware set for this assembly so you can see the included covers.
I have also attached the written installation instructions for the Nerf Bars that you can check out. view full answer...
The hardware kit for your 2011 Lexus RX 350 has been discontinued by Aries. I do have a list of the hardware that you can source locally.
2- 12mm Lock Washers
2- 12mm Hex Nuts
2- 12mm Oversize Hex Nuts
2- 12mm ID x 35mm OD x 3mm Flat Washers
2- 8-1.00mm x 25mm Hex Bolts
2- 8-1.25mm x 40mm Hex Bolts
8- 16 mm Lock Washers
8- 8mm ID x 22m OD x 3mm Flat Washers
The two 12-1.75mm x 60mm Bolt Plates, two 12-1.75mm x 120mm Bolt Plate and two 8mm Nut Plate will not be able to be sourced locally... view full answer...