[RaycinSS]

Got the factory tow hook in and have some pics and info to share. (Thank you Maureen at Rodgers Chevrolet)

GM factory part number is 25887376
Threads are M18 (Metric 18mm thread x ? pitch) and threaded portion is about 1 1/2" long. I don't know for certain if the pitch is 2.5 mm or 2.0 mm. I am told that if it is 2.0 that Subaru tow hooks might work. Will update when I am able to verify.

If you get the factory hook be aware that the threads were painted and I had to oil them and use a cheater bar to turn it a few times and keep the paint from seizing it up. Not something I want to have to deal with in an emergency.

I included a picture with the hook installed in the impact bar looking straight down from the top to show how the hook is in line with the long axis of the vehicle and not perpendicular to the portion of the curve where the threads are. The wide angle lens distorts it a little and makes it look like its at an angle but I believe its just a product of the cell phone camera lens. I tried to line it up with the grid lines on the tile to give a better overall idea. I personally like knowing the pulling force would be in line and not side loaded.

I like the look of the aftermarket hooks with the hinge and will be getting one of those next but this factory one will stay in the car for emergencies. I haven't decided whether or not I want to leave one of the flip down ones installed for looks or not.