the factory nut is a 1/2x20 with a 60 degree seat

 

if you have a welder you can drain the air in the tires and then weld a nut to the old nuts then just use a socket and take them off. i do this all the time when people loose there locks. or the key breaks.

 

See what prices are like at your local parts stores. I just get 'em from advance. Don't have to pay shipping from them, so, they end up being cheaper.

That, and if I get the wrong parts, it's easier to get the right ones.

 

Ok. I haven't checked the local napa or O'Reilly's yet. I might just go local as well