You will want a " Dorman " #615-138 - 6 lug axle nut ( 2 1/8"-16 thread and 2 7/8" OD ) avaliable by order from most parts stores . Cost about $40 ea.
Also you will need a O.T.C. Tubular Spanner Wrench ( socket ) # 1930 for 6 lug 2 7/8" OD axle bolts also avaliable by order at most parts stores . Cost around $65
This is what I have had to get for my 2 tons. ED H