You Will Need: Model, Year, and Vehicle Identification Number (VIN)
Located: Your VIN is Located on the Metal Tag in the Lower Driver Side Portion of your Windshield or on the Vehicle Frame Rail.
You will need the following for the DT-466E: You will need the Engine Serial Number which will start with 469H or 470H.
Location: It is on a Tag on the Valve Cover. It is also Stamped on a Pad on the Side of the Cylinder Block just below the Cylinder Head to Cylinder Block Parting Line. Depending on the Year this Stamp could be on the Right Side or the Left Side of the Block.