Which Land Cruiser?
FJ40 is roughly 55" between mounting surfaces I think. '78 and older had 4.11, '79 and newer had 3.73.
FJ60/FJ62 is about 3" wider. FJ60 ('81-87) had 3.73. FJ62 ('88-90) had 4.11.
I don't recall the widths for 80-series, but they all had 4.11s.