5.3 exhaust manifold o-ring?

[Mikebleedsgmc]

I bought some cheap manifolds for my ls swap. Exhaust Manifold Kit 9988-R-BLEM . The flanges to bolt onto manifolds came with whats looks and feels like rubber orings. Have i smoked to much happy lettuce or is this legit to use?? Thanks for the thread great advice.

[b-mac]

I will say that this o-ring doesn't necessarily "feel" like metal, but definitely is metal of some kind. The old one was darker too, so it looked even more like not-metal.