This is just some more info for those who may need it in the future .
O.T.C. - #1929 6 lug for 5200 & 7200lb axles ( socket OD 2 5/8" )
" - #1930 6 lug for 11000 & 13000 axles( socket OD 2 7/8" )
" - #1931 6 lug for 15000 & 17000 axles ( socket OD 3 5/8" )
SnapOn - # ANS1929A 6 lug for 5200 & 7200lb axles
Also - Dorman Products - has axle nuts for most trucks .
Item # 615-138 is the correct nut for most 50's era Chevy 2 tons @ about $40 each .
ED H