Anyone know the bolt diameter and thread pitch of the rear leaf spring front eye bolt?

The nut fell off, just noticed the bolt 70% on its way out 30 miles from home , kicked it back in as far as it would go and slowly drove home.

I'm off to buy a new nut tomorrow, but if possible I don't want to have to jack my truck up and pull the bolt to get the sizing.

 

call and see iff the dealership has one.. its a nut with a large flange on it too.. probally should use and OEM one anyways...

 

Probably 14mm, not sure of the pitch, probably 1.5mm. You can replace it with a 9/16" bolt, if you can't find a replacement nut.