If you want to avoid all the aggravation with the rear oil pan seal, just use RTV. I place a 1/4"-3/8" bead on the rear cap, clean and dry. Let it set up for about 15-20 minutes, then carefully place the pan on and torque the fasteners. Haven't had a leak in years in that area and I smoke test every engine . 2nd choice would be the cork gasket, (s) over the cap. But why add another material to the mix?. RTV is great for filling gaps and as a gasket replacement when applied to clean and dry surfaces. Useless if applied to an oily or air-tight joint. Once fully cured, I trim squeeze out with a single edge razor.
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