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Buy two of these things! I cracked my battery hatch when replacing my battery and none of my LDSs had this replacement part - A call to scuba.com secured two replacement battery hatches (one spare) and I was quickly back in the water.
Replacing the O ring when replacing the battery is a factory recommendation. The last thing you want to do is skimp on an O ring on a $700 computer. I purchased two kits so I could have one in my spare kit just in case.