Ok, so now i am completly confused on belt size....

first, allmercedes and Autohous list two belts for my specific engine ...

6PK2415
6PK2475

which one is the stock with the pump? I have read so many posts about shorter belts, yet they seem very inconsistent especially for the 104 engine.....

any ideas?

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1993 300E, 2.8 M104 .....