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It would help if we know what mfg. & model helmet you are going to attach this to, then we can give you the part numbers you will need.
I have never been asked this question before, who says they can or can't, my guess would be it's up to your chief officers. Some departments don't allow the FF to change anything to their TOG that didn't come with it. You will have to ask the chief if you can use this eye protection.