This seal was all I needed to tighten up the vacuum system on the '85 (after replacing all the rubber vacuum connectors and dashpots under the hood), so don't overlook this when trouble-shooting lock/engine shutoff problems. Use your MityVac and a good diagram.

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1985 300D-189k The 'UD', Ivory and Pinkamino
1979 300D-211k Dark Gray, Parchment
A 1980 Harley-~166k and
A 1994 Ford diesel pickup-349k and
A 1990 gasser Volvo wagon-145k