@bajaphile, for the spindle nuts, I got the chromoly locking nuts from Trail-Gear. They're still sitting on a shelf, until I service my knuckles. I read good reviews on them, as far as staying torqued. Maybe others will chime in with their experience.
I have them sitting in parts box also but I torqued the inner nuts to 25lbs and it hasn't come loose yet after 2 years so I assume he will be fine for a long time.