MGB axle nut size

[gmapes@ball.com (Glenn Mapes)]

Hi All
A friend is trying to rebuild the rear axle from a 1965 MGB (early style 
rear axle).  He has measured the size of the nut that holds part of the axle 
assembly to the housing as 1 15/16.  He has not been able to locate a socket 
of that size (Snap-On, Mac, Sears, etc).  My questions are:
1. is this the correct size?
2. if so, where can one obtain a socket of that size?

Thanks in advance

Glenn Mapes

1968 MGB
1965 MGB