I have a 4 cylinder glow plug relay. Not sure if it's the one you need. I could always use a spare GP relay. Wanna swap?

http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/337488-fs-ft-240d-g-p-relay-300td-injectors.html

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82 300TD
75 300D
99 F350 Crew Cab 7.3 Powerstroke