The latest revision genuine pump will be your best option, there probably are aftermarket ones available but I doubt the quality is any good and as stated it’s usually poor install that causes these to fail, I have recently had a new pump fitted as there was a small leak on the old one but it actually turns out the old pump was fine and it was just the seal that had become hard and wasn’t up to the job any more, that was the original factory fitted pump at approximately 100,000miles, I could have just changed the seal but fitted the new pump anyway seeing I had removed the old one already!
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