This is the gasket that goes in the power steering reservoir cap. Fits all 5 cylinder diesel engines from 1978 to 1985 including the 300SD 300D 300CD and 300TD.
About my electrical problem... just thought I'd pick the brain of a more experienced mechanic. By the way, I have almost all of your repair manuals. you do a really great service for all of us owners of older Benzes. Great stuff! Thanks again.