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Oil seal identification issue for 7116



My 7116 has a leaking front oil seal.  Engine is 326437-0252-01

When I look up parts for the engine it lists two oil seals, 

20  691948 Seal  Oil (PTO Side)

20A  291675 Seal  Oil (PTO Side)

The parts are not shown in an exploded view indicating where they go so I am not certain if this indicates that one side of the engine uses part 20 and the other side 20A or if a variation in engine models calls for part 20 on both sides and another variation calls for 20A on both sides.
If it is one of each, how do I know which one is the front PTO and which the rear?  I do not want to order both, I do not plan on pulling the engine to replace the rear seal as it does not appear to be leaking but the front is literally spraying oil.

Can anyone provide any clarity on the meaning of the 20 vs 20A in the parts list?

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