Here's a picture of the passenger-side floor pan now that I have it exposed. Not sure, but this may have been a case of rusting from the rocker panel in to the passenger compartment. I say that because of the location which is not at the lowest part of the floor pan, and there's a rubber plug missing on the bottom of the rocker panel near the rust area. It might also be water dripping in by the door seals to this area.
This should be repairable with plain sheet metal bent to the proper curve around a pipe, and then welded into place.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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