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I have a Cobra Aluminum T-sump Cobra pan. It is listed as a 6.5 quart capacity. When there is 7 quarts in the pan it registers right at the Add line. I have the dip stick that was in the vehicle when purchase in 1982 and I wanted to confirm the number stamped as correct for application. It is stamped: C7AE-6750-A. I do have the factory Ford windage tray, which I haven't heard of anyone having interference issues with. I remember reading that there was a TSB that required the change of the dip stick which changed the indicator marks for the added oil capacity. ( 6 quarts)I thought that would make sense under the circumstances. -Keith