O-rings are usually pretty fungable. I have a couple sets of O-rings in a variety of sizes.
And I have the ARB covers but have not broken an o-ring yet. The two things that come to mind are not having the o-ring lubed, and over tightening. I don't see why one would break.
I've never had one break, or leak. I have had them chafe and get nicked up, which ARB says is normal with some of the units. Yes, I coat them with oil. I just can't see reusing a nicked up o-ring, even if it won't leak.
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