Hello,

If anybody is in need of non-resistor spark plug for your mercedes I have just ordered some from BERU. Here is the link, $3 each..................
US Distributor of genuine BERU products -http://www.beruparts.com

They are located in San Marcos California and the Tel# is 800-643-0375

They had to order from Germany but are listed in their stock as current and available.

My handbook for the Mercedes 300ce/m103/w124/1989 says I need the following plugs in my car..........
1]Bosch H9DC, H9DCO, or H9DP
2]Beru 14K-9DU, 14K-9DUO, or 14K-9DPU
3]Champion S12YC, or S12YCC

Good luck:

Gavinbr