So I'm on ebay and found a dealer that sell new dip stick tubes. I have the old body style (OBS) 1997 F250HD 7.3. They have two dip sticks. One for the trucks under 1997 and then one for the 1997HD and superduty. I know they made a light duty and heavy duty truck but, they requested my vin # to verify fitment before buying. They sent me to the 1997HD and super duty dip stick. I thought the Heavy duty was the same as the 96 for the engine. The only thing I can find is Ford made a oil pan revision from 96 to 97 that would make any sense. Any input on it and why my vin would make the 1997 dipstick show up that's only for 1997 diesel trucks.