The retrofit was using a W140 regulator.

The retrofit may be avail as a kit now. Click the Fastlane link above.

While there, check the regulator for your year too. It was replaceable on my 99. You MUST pay close attention to the chassis cut off number range to determine if applicable to yours as well.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)