530019042 is the FW side. Goes into the "bearing carrier" under the flywheel.
530001936 inner PTO side seal that goes into the crankcase.
530019035 is the seal that goes into the oil pump housing (you'd call this the outer PTO seal).
Industrial equivalents for all three of these were found in Mark's "Seal Finders" thread. Search Mark's started threads list and you'll find it.
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