Don't buy a block-off plate. Either disconnect the Vac line and plug it (BB or screw) or remove the EGR gasket and use it as a template to cut a steel plate with NO center hole to replace it. Looks factory and stealthy

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1987 300TD 147,000 miles- Palomino leather interior, 1995 facelift and body cladding, E350 wheels, Rebuilt suspension and sport springs, rebuilt turbo, New Monarch injection pump and injectors....and the list goes on and on...