[DeTomaso] Front Spindle Nut replacement

[bwerner at live.com]

Help Needed:  I am rebuilding my suspension on my 73.  I had all the suspension pieces powder coated and I am putting things back together.  I would like to replace the front spindle nuts with a castle nut, so that I can cotter pin the nuts to the spindle.  I have noticed that one spindle is right hand thread and one is left hand thread.  Any ideas where I can find the castle nuts in both right and and left hand thread??  I do realize I have to drill the spindle for the cotter pin.  Any help would be greatly  appreciated.  Thanks.