Rick,
The attachments should help you.
Be sure to heed the attachment on the sources of other potential leaks, most of which will drain to the back of the engine and give the appearance of a leaky rear seal. Some years ago, we incurred great costs in having one of our rebuilt engines shipped back to our shop to replace a reported defective rear oil seal. We had already paid to have the first oil seal replaced by a local mechanic and it was then reported to us (by a supposedly very competent mechanic) that the second seal leaked as well, due to some mystery defect in the transmission itself. To make a long story as sort as possible, it turned out that the rear seal was perfectly OK, but Oberdorfer water pump had a defective oil seal and the oil followed the top of the oil pan back to the area of the rear seal.
Don
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