Need 3 inch diameter o ring for chance L and some others

Is nitrile safe for bad dragon silicon, the easiest way to get any size o-ring I've seen is to get nitrile o-rings, the actual seals not ones made for harnesses

The Tantus silicon o ring set only goes up to 2.5 inches which isn't enough our chance large or mystic medium but would do for medium chance and medium ika
I was thinking of getting a set of the tantus o rings and a 3inch and 2.7 inch nitrile o-ring for the large chance and , medium mystic

 

I was in the same boat and found some stainless steel rings of various sizes on Amazon.