Figured it out: If you want this to work correctly, you need the bracket from a 1995 E320 (W124) and the AC compressor from a 93-95 E320. The bracket and AC compressor must be from a car with a MAS relay or your AC won't work.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.