I've got mine apart now, would have to measure...but I purchased a tool about 10 years ago from SOR or someone for mine...almost looks like an exhaust pipe formed to fit with a backing on it for a 1/2" drive....
MARKUS: on my fj40-1978 front hub spindle nuts are 54mm.
autozone and pepboys didn't have the socket, or wanted an arm and a leg for it. Built my own faster than they could get it. I think Man-a-fre has the tool for maybe $20.00????
Try SOR also.