Going to the junkyard tomorrow they have a 617 car there but i need an alda for my 603, are they interchangeable?

Most of the 617.952 engines have MW Fuel Injection Pumps. I believe that the 603 has a M type Fuel Injection Pump and the construction betwen the too is likely not the same.

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84 300D, 82 Volvo 244Gl Diesel

https://www.youtube.com/watch?v=i6TZ2bnlAjI

I have some extra ALDAs if you need one....just PM me.

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 161k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 147k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 81k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

Has anyone actually been able to get the screws out that easily? I can't budge them.

Without a doubt that top screw on the right was a bugger to get out. I believe he had previously loosed that screw. My guess is that he had clamped in in a bench vise and used an impact driver to handle the job after having a screw driver fail.

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84 300SD
85 380SE
83 528e
95 318ic