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For my regal xl USA 30 footpouind I ordered these O rings. The closest I could find to the specs. 004 N90 Buna-N Nitrile O-ring Duro 90. Is this the same as .22: -004 Buna-N A90 ???????????????? Is a Duro 90 the same as a A90? Could not find anything A90. Below is a list someone...