I ordered a replacement window guide for the rear window in my 190D. Today I tore the door apart to take out the old and put in the new. The part I have doesn't look like the part that is broken, and I can't figure out how it can work. The old part has the same rectangular piece that slides into the channel at the bottom of the window. But the old part also has a flat metal plate and then a gray plastic piece that the cables attach to. How are the regulator cables supposed to attach to this new piece? I can't find any other part associated with a 1984 190D. Is this the wrong part, or am I missing something?

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1984 190D 2.2