Im trying to buy an ECM from this website http://www.autocomputerexchange.com/Product/93 for my dodge dakota 1998 and it asks you for vin # and mileage and part number.
thing is we have changed the original ECM for an autozone ECM twice and we called the website and the part number was suppose to be on the original one but we exchanged it in for a discount on the autozone one and now we cant buy a new refurbishment one because we dont have the part number it asks for. and the one it has now (the one from autozone) doesnt have to part number on it
so can someone help me how to find it somewhere else in the car.

i also have a car diagnostic tool and this tell me the part number