I went with Viton, which is probably far better than the OEM version. I'm pretty sure the OEM are nitrile. The local o-ring supplier had a minimum order of $20. So either way I paid $20 plus. Going this way you should get lots of sets for your $20. I also replaced the o-ring insulators for my BDE Fuel Rail top feed set-up, which was my main objective. Earlier runs of the BDE rails came with nitrile o-rings which swell and lose their shape pretty quickly once they come in contact with fuel.
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