You can get crimped lock nuts to go on the new studs. They have the three stamps that deform the last thread or two and stay put well. Be sure and get grade 5 or 8 studs. I ran a home made full float kit on the back of my CJ for years with this set up. With a locker it was hard to find something that worked and stayed tight. Those nuts did.
My duece selectros came with new bolts and lock washers. I need to check them.