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You don't know if a previous owner had already replaced it with the wrong part, which may have fit, but may not have worked 100% correct, or may have been modified to make it work.
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Actually I do. Same part number from two different coupes.
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Bottom line: You jumped into the deep end without a lifejacket. If you don't already know MB's part number logic and general interchange, you've got a seriously steep learning curve ahead of you.
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It's not as bad as you make it sound. I know the W123s extremely well. The issue is mostly that I just know the diesels from doing repairs and that I'm slowly learning the applications of other parts. Plus I want to be able to create a system that I can train other people (who don't have as extensive a knowledge of the interchange) to use.