does anyone know what size socket to use on the nut that holds the hub on? have to replace the rotors and don't have anything that big !

I used a 2 1/8th. Worked fine. They sell them at Sears in 3/4, you will likely need to buy an adapter from 1/2" to 3/4". Or try Harbor Freight to save some money; as Sears charge about 40.00 for both.