[Ngtflyr]

The over the counter ones require the "fatter" gasket, for 1975 or 1976 and newer oil pans. The original ones use the "thinner" gasket. I just went thru this education process the hard way, had to drop the pan twice before I figured it out. The forward end is a little taller on the over the counter, later pans. They have different part numbers also.