There is really only one gasket, for the pan. Be sure and use a torque wrench on the pan bolts. If it is leaking around the dip stick grommet, you may have to see the dealer about a replacement. The cooling lines attach with banjo bolts and 2 copper washers. More than likely, it is the pan gasket since they tend to get over-torqued by mechanics.

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Sam

84 300SD 350K+ miles ( Blue Belle )