The Fox Mustangs used a 0.625" knurl in a 0.609" hole. A 39/64" drill bit makes a 0.609" hole. A 15.5mm reamer makes a 0.610" hole, and is a tighter tolerance process than drilling (IMOHO). The stock SN95 hubs take a smaller knurl, and thus must be machined to above specs.
Brand: ARP Automotive Racing Products
Product Line: ARP Wheel Studs
Wheel Stud Style: Press-in
Thread Size: 1/2-20 RH in.
Knurl Diameter: 0.625
Underhead Length (in): 3.500
Knurl Length (in): 0.400
Quick Start Nose: Yes
Quantity: Sold as a set of 5.
Notes: Fits Ford rear disc brake and Chrysler front brake applications.
Wheel Studs, Press-In, 1/2-20 in. Right Hand Thread, Set of 5
Tough enough for competition.
These extra-long ARP wheel studs are designed for today's thick-centered, high-performance and racing wheels. These chromemoly steel studs are heat-treated and have a 190,000 psi tensile strength rating.