67 Wheel Stud Knurl

Hi all. I'm getting the parts ready to finally install my Mustang Steve disc brake swap and have hit a snag with finding new studs. I've measured the studs that were pressed out of my drums and got a diameter of 5/8ths (.625) for the knurled part and 39/64ths (.609) for the smooth part of the shoulder. I found studs on summit with about 6 knurl diameters ranging from .610 to .625" I'm assuming that .625 is the one I need, but want to make sure. Also, can anyone suggest a place to buy some that's not $70?

Thanks.

The shoulder on drum brake studs won't allow the discs to sit tightly against the hub assembly. Besides I'd rather not trust press on studs to seat tightly after being pressed on the second time.