Can anyone with a Wilwood kit explain this

I've done some comparisons of the SSBC vs Wilwood drum to disc upgrade kits for my ride. I've got a 9" drum spindle, and I'd like the SBP and BBP interchangability of these kits. To me, the Wilwood kit wins out just because it's lighter, it's already poweder coated, and the rotors are drilled/slotted. Those upgrades on the SSBC kit would put the price a good bit higher. Anyhow, my problem is with the Wilwood 1/2" wheel hub studs. How does this work with wheels? From what I understand, some wheels are 7/16"? If some wheels are 7/16", and I assume some are 1/2", then why isn't this incompatibility even mentioned? Am I making a bigger deal out of this than I should? Are the only wheels that have 7/16" holes going to be the steel stockers? What's the deal here? I am running the stock 14" steel rims currently, and I haven't gone out and taken an exact measurement of the stud holes yet. Can anyone clear this up for me?