Anyone know anything about these? I can't find any info on them, just the earlier designs with crossbars and pins. I'm trying to decide if I want to keep these, or the stock Ford ones,when I sell one of my axles

 

They are the best! I have a set on my 44 and a set for my some day 60. Easy to turn and almost unbreakable.

 

Made by Selectro originally & still available through mile marker, but their site isn't listing a # for the internal style D60 lockouts.
I'd say they are both durable & desirable but not stronger than the original Spicer's.