Replace them all. I have on my 190E and it actually made the idle better and performance a little better. Mine were all hard and starting to crack. New ones are nice and soft and flexible again! Keeps those babies sealed better and does not let in outside air like the old.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....