are these supposed to look like that? head to carb adapter

[Graham]

The OEM are not as good as Viton. If you bring the boots to the seal store, they will hook you up. I'm thinking it's 2.5mm thick, but they may not be right.

My factory OEM o-rings lasted 28 years. How much better can someone ask for?

[Nessism]

I suspect the OE rings are viton already.

[Crazy_Russian]

you maybe giving them too much credit