Got a pic of the modulator? Mine is an oddball arrangement; if yours looks compatible, I may be interested. Do you know if it's compatible with the early W123 diesel transmissions (specifically, a 1980 300D)?

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)