Source for this Tiga spindle nut?

[cgscgs]

Sorry the picture is upside down.

This is the hub/spindle assembly, and the nut, from the front of my Tiga FFA-81. I believe the thread is 1.25" x 20 tpi and the nut is 1.5" hex. I assume this came from a British car of that era (some of the drive parts are from a BMC 1800 Landcrab, for instance). Any thoughts on where this nut came from, or more importantly, where I might find some now? Thanks!

[Phil Creighton]

I was the tiga importer for a while and we heard the same thing about the BMC 1800. Someone also told us that a Suburu part fitted but I have a harder time thinking a Japanese Metric nut would work on a 70's British axle