Rowdie,

Thanks for you help. There are lots of online parts suppliers who list this speed sensor. However, if you call to see if they actually have it in stock, you find out that they do not. This is the reply I received from XXXX

Your e-mail arrives at the Mercedes-Benz dealership which fills orders collected by the website Parts.Com. The part is currently on worldwide backorder and may take up to six weeks before we could get it to you.

Frank