Originally Posted by t2d2

The seatbelt is metal where it clips in and metal at the exposed portion where the belt loops through. I can't imagine it wouldn't be metal throughout the rest that you can't see, given its safety purpose. You may be right about those other ones not being plastic, though. I looked back at a few and see some of them described as metal even though they look like plastic, so maybe they're coated? Others that look the same don't specify. But I read that the Sparco one which looks the same is plastic... At any rate, there's significantly more metal on the seatbelt buckle than any of those brackets. Just look at the shape and how little material they have around the tapered portion surrounding the bolt hole.

Originally Posted by Cleanshots

propper tow strap metal part is twice as thick as the metal on the seatbelt..