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*SEE BELOW FOR UPDATE* So, after hunting on the internet with a rhetorical shotgun for skid plates, I decided to do some research into OE parts. Here is what I found. for the metal skid plate (splash guard) from the bumper to the first crossmember, the part number is 86803306. Can confirm through ACDelco’s website that it is metal. I’m not sure what kind. When shopping through GM dealers, DO NOT INPUT YOUR VIN. I’m currently battling it out with Chevy Parts Pros and told them to pound sand if they won’t send me my part. Does NOT FIT DURAMAX OR 2.7L MODELS UNLESS YOUR ORIGINAL PLATE IS p/n 84125967. This plate is factory on vehicles with “enhanced tow”. for the steering gear plate, part number is 23385004. It is 1/8” steel, I believe. for the transfer case, part number is 84699480. This shield spans the gap between the trans crossmember, and another behind the transfer case, uses (4) m8 x 1.25 x34mm bolts and u-nuts to secure into place. Fits 2019-2025 models, 4x4 only. It’s powdercoated 1/8” steel. you can get the steering gear shield and the transfer case shield in a set through GM accessories under “off-road skid plates set”, but I found it cheaper to order some off-brand bolts/u-nuts and get the parts individually. cheers! ******************************************** My parts finally arrived. 86803306 does in fact fit in place of the plastic shield, and is made of the same material as the trail boss skid right behind it covering the steering gear. I do believe it’s either aluminum or mild steel. I took the air deflector off the bottom of the bumper to mimic a trail boss. The plate bolted right up and I had zero issues with install. Took 10 minutes with a ratchet, extension, and socket.