Assuming they read the same, just take the new MAFs factory Corvette plug, which would be available at a dealer most likely, and take the pins out of your Astrovan harness, and pin them inside the Vette plug. Its probably only 3 or so wires, so you just have to figure out which ones are the ground, 12vt +, and signal and switch them into the new plug out of the old harness.