I purchased the dually rear set and also the front set for my 2019 GMC Sierra 3500 HD Denali. I hesitated at first with the purchase due to the cost, but now that I have them installed I understand why. They are very thick and heavy rubber!! Very easy to install, just follow the directions. They look great on my truck and I am very happy with the quality, fit, look and delivery time. I would definitely recommend these!!
Since this is an expensive accessory for your Navigator, I hope this review will provide a solid pre-purchase understanding of the product, as follows: Styling - A+ Quality - A+ Fit - A+ Proportion to vehicle - A+ Apparent durability - A+ Time from order to receipt - A+ Meets expectations - 100% Installation instructions - A+ Advertised time to install - D (I’m 78 years old & have been working on vehicles since I was 13 & my experience is, the only thing that can be done in 5 minutes is to break something). Modifications I made to the installation are a small 90 degree sheet metal bracket (RH&LH) to support the inner edge of the product - see pictures & painted the exposed mounting hardware “black”.