Holden,
There are several means of doing so.
Arguably the best would be the Technical Bulletin to do so issued by MB some years ago. Contact me off line and I'll send you the information and parts list.
Other vendors to try include Brian Peters of Motoring Investments in San Diego; Gernold Nisius of SL Tech, and Bud's in Georgia. All of done this at one time or another, not always with the above reference.