Pills my a$$!
Al, you don't know what the hell he has on there. I have 14mm on my 4-lug hubs and 14mm on the adapters, but he has (supposedly) wide 5 hubs which could be 12mm or could be 14mm and you certainly don't know what the thread pitch is until you put a thread pitch gauge to them because you don't know who drilled/tapped the hubs for the studs or bolts.
Somewhere along the line these new guys (or even old guys) have to get over asking dumb questions, take responsibility for their cars and learn how to take care of them!
Look, Scott...... What you are asking is impossible for us to know. Why? Because you have "wide fives, a front disc brake conversation and the aluminum brake covers". God only knows what was used in that conversion by someone we don't know and we certainly don't have a clue without being there and measuring the studs or bolts to figure it out. Only YOU can do that, so remove a lug bolt or lug nut, go to a tire store or a decent mechanic or (even better) a decent machine shop and find out what they are. Ed's suggestion is good, too. Try Home Depot.
It remains that simple.