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M4.2-1.41x 20mm Black Hex Head Sems Tapping/Trim Screw 

7mm Indented Hex Head

17mm Outside Diameter Large Loose Washer

 

OEM

GM and General Purpose

GM: #11503892, #11500434, #11502449, #11503403, #1640810

Car-Pak: #79-5005