$9.99 at Autozone for Bosch. Part number 80006. Don't forget to buy them two at a time with a pack of gum each time so that you get your frequent buyer car punched each time. 10 times gets you a $20 store card. (I think it is $20.)

-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.