SBP SG 8.75 Wheel stud size?

Knurl size??????..........

Moroso 46150 Press-In Wheel Studs, 7/16-20 x 2-7/8 Inch, .480 In. Dia (speedwaymotors.com)

Mr Gasket 4310G Competition Wheel Stud, 7/16 Inch (speedwaymotors.com)