Rear shocks for 1983 b2200

The guy at napa couldn't find shocks that would work for my truck. All the shocks had a circle at the end, my shocks have a straight threaded bolt on the end. I put a camper on and I need heavy duty shocks to reduce sway and handle the weight better. Any ideas?

Found this, looks like it's got the ends in the format I need, but I need real stiff heavy duty shocks.

If you need stiff shocks with a threaded end try a set of front shocks from a 1988-1998 full size Chevy truck. If you want them really stiff maybe look into a set for the front of a Chevy 3500 with a big block.
Sorry if they don't fit but I figured it was worth a try.