Bolt size

Highway Stars
Stud - Deflector (Air Dam) Mounting - Original GM
Washer (1) - Deflector Mounting Spring Steel Washer - Original GM

Make your own:
Stud - 8mm x 1.25 x 40mm
Nut - 8mm
Spring Washer - 8.2mm ID x 27.14mm OD
Air Dam Stud_Bolt_Spring Washer.jpgSpring Washer ID.jpgSpring Washer OD.jpgAir Dam Stud.jpgAir Dam Stud_Bolt_Spring Washer Assembly.jpg
 
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