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New style seals are called "heat shields" and look sorta like washer. Old style seals go into the hole in the pre-chamber and the injector nozzles seat on them. They are VERY difficult to remove.
What you have is both in place, and if you don't have any problems, leave them alone. I have one in the 220D -- couldn't get it out, so I left it. I had compression leak problems with the new one on top of it. Check for oily stuff collecting around the injectors -- this will be unburned fuel. If you get bubbles in it while running, you need to remove the heat shields and use the old seals that are still in there, or put a wood screw into them and pull them out.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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