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I have a 1996 E350 Club Wagon Chateau that needs a new brake master cylinder. I bought a replacement from Auto Zone that looked identical to the one I removed. But when I put it in the van realized that the ports for the brake lines were the reverse from the stock mc. My stock mc has a large port in the front (towards the grill) and a small port in the back. I returned the mc and while I was there they said I had a Super Duty. My van has nothing on it to indicate that it is a Super Duty. How can I tell if I do have a Super Duty?
Thank You