I've been struggling trying to find the proper serpintine belt for my 87' 300E. The part that I got from my MB dealer shows nine pulleys on the diagram. The bottom left pulley does not exiist on my vehicle (only 8). I also replaced the ideler pulley (top left) above the alternator, it seems, from memorey to be smaller than the one I had before, being that the other one is out on the road somewhere, along with the old belt. What parts do I need, my local dealer has been no help.

diagram that I have...

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