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I have a 67 GTO disc brake front that I just added 17 in American racing wheels to. The wheel and tire combo fit fine however the studs appear to be to short I only seem to be grabbing a couple of threads on both the front and rears any idea of where I can get longer studs. its an original brake setup
 

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Welcome to the forums!! :cheers
According to my NAPA PROLINK

Front:
Wheel Bolt Knurl Dia. : 0.564"
Wheel Bolt Shoulder Length : 0.375"
Wheel Bolt Thread Size : 7/16-20
Wheel Bolt Threads : Right Hand

Rear:
Wheel Bolt Knurl Dia. : 0.472"
Wheel Bolt Shoulder Length : 0.34375"
Wheel Bolt Thread Size : 7/16-20
Wheel Bolt Threads : Right Hand

Doesn't really say how long they are, I would pound one out and take it in to a parts store and get one longer and test it out. Maybe spray something on the inside of the nut so you can see how far down the stud it's going.
 

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I have a 67 GTO disc brake front that I just added 17 in American racing wheels to. The wheel and tire combo fit fine however the studs appear to be to short I only seem to be grabbing a couple of threads on both the front and rears any idea of where I can get longer studs. its an original brake setup
What is the wheel & tire combo you mounted?
What did you end up doing with the studs?
 
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