Hello. My glowplug relay on my '81 300SD is not working all the time so I want to replace it. I understand there is one that keeps the glowplugs on for a couple of minutes after the engine is running. Does anyone have one of these or know where I can get one? I saw a Bosch #7001591953 on Ebay but it came with glowplugs too. Since I just replaced my glowplugs, I only need the relay. Thanks for your help.