I purchased a (third! 😆) 2006 Jeep Liberty KJ CRD that must have started life as a base model, because it only has the forward-most and rear-most skid plates. It's missing the skids for the transmission pan and the transfer case. Luckily I have a parts CRD that I could pull the missing skid plates from, but when I went to install them, I found that the frame rails where the skid plates attach do not have threaded holes for the M10 skid plate bolts. There are simply hex shaped holes where the bolts should thread in.
What I found is that these locations need a M10 1.5 10.9 steel hexagonal rivnut (also called a rivet nut or nutsert).
I checked with my local Jeep Dealer parts dept. and they had none in stock when using a 2006 Jeep Liberty for the search (part #6504601). They searched nationwide and were only able to locate two at a dealer in TX and one at a dealer in IL. Those were literally the only factory rivnuts my dealer could locate for a 2006 Liberty.
So I went home and widened my search on the internet (I should have just done a quick search on my phone for this M10 nutsert on other Jeep vehicles while I was still at the parts dept.).
The first solution I found said the M10 nutsert I was searching for was for 18-25 Jeep Wrangler JL & Gladiator JT (with no mention of the 2006 Jeep Liberty KJ CRD). I'm sure this part is used on a lot of different years and models and may have a different part number for each and every make/model (brilliant, Chrysler!).
The Mopar part number for this M10 1.5 10.9 Steel frame rivet nut found in the search above is 06511076AA. Various Mopar and Jeep dealer sites on line stated that this would absolutely NOT work for a 2006 Liberty.
When I called my local dealer back and used the parts number for the rivet nut for a 2025 Jeep Wrangler, they had plenty in stock at $8.20 each (pretty high price, but I guess I'll pay the premium for the 10.9 steel over the zinc coated "medium steel" versions I was able to locate online).
As you can see from the two photos, the rivnuts do look different. However, I can verify that the rivnut that works with the Wrangler and Gladiator can be used for KJ Skid Plates and other Jeep frame components like fenders, rock rails, etc.
I'm sure there are other Mopar numbers that turn up rivnuts that work across the brand, but 06511076AA is what I'm using for now (I'll update this post if others list other part numbers in the comments).
For the record, I could find mild steel zinc coated M10 rivnuts online, but I decided I wanted to use the original 10.9 steel rivnuts originally spec'd for our vehicles.
