I just looked at Worldpac and found the following:

Old regulator was manufactured by Reitter&Schefenacher and uses motor number 001.820.97.42

New regulator was manufactured by Brose-Coburg and uses motor number 004.820.14.42

From what I can tell from the Worldpac site, both are OEM,

Hope this helps.

Paul M

P/S I am not saying the above is correct, only that this is what Worldpac says.

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84 500 SEL (307,xxx miles)