$14.00 seems fair enough. The $10 price for me was about 3 years ago.

I see no point in replacing all, if there is nothing wrong with them.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black