I have a couple of ALDAs from 603 engines. Set screws have not been touched. Email me if interested.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles
06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

603 and 617 ALDAs are physically interchangeable. Whether they have the same response curves is another matter. Someone can verify by comparing comparable sections of the FSM.

Sixto
87 300D