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Neck size probably refers to the extension of the filter output pipe above the top of the filter. This would be the pipe that goes up into the transmission when you press the filter up into place.
I would strongly advise you to buy the correct replacement part, such as the Mann filter quoted to you. If you go NAPA, it might be OK, and then again it might be the "nearest best fit" kludge.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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