when you push them through, they fall into the air intake housing...just pick them up and re-use them. If not, you can buy extras at mail order houses ...fastlane, Parts shop, Performance, etc. Once you take it appart, it will become immediately evident how they function....very simple.
Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)