Power steering pump

MG ZT 2.5 V6 01 PLATE



I'm looking to buy a used power steering pump, I've bought which my mechanic has come to fit and tells me it's slightly larger than my previous one, I bought this one off an 04 plate (wasn't aware there was a difference) would anybody happen to know a part number for the one I might need, so I can cross reference it before I buy another one ???

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