I Bought Bosch From Advance I Think And At First Like You Said They Came Off After About 20 Cycles But I Was Putting Them On Upside Down And After I Got Em Right They Work Fine. THEY WERE NOT 50 DOLLARS EITHER.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual