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Here you will find the part numbers for the GM MAF sensors we've used in our testing and calibrating of ECMLink's integrated GM MAF functionality.
GM 3.0“: 25180303 GM 3.5”: 25179711 GM 3.75“: 25318411
Those are GM part numbers. They can be referenced to other part numbers or ordered directly off the rockauto.com site (just one of many sites you can find these airflow sensors on).