I know it's not technically an 'interior' item but how do I know if they are the hidden style or not? Bought the car without a wiper system (arms, motor, pump, squirters, etc) and need to get some. It's a '71 Malibu.

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71 Chevelle SS clone 454 th400 Ford 9" 395hp/435tq at the wheels
79 Z28 under construction...