whoops,i just realized the part you were talking about....im not sure what that does, all the regulator guides in my car look the same....i just replaced the one in the right rear door, and the one i just took a picture of is for the front left, so im not sure you really need that kind

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1985 300SD 192,000miles...Astral silver/ Grey MbTex

1983 300D 194,000miles...White/Tan MbTex...my newest addiction