Needed:
(2)3/4"x4" galvanized plumbing nipples
3/4" wrench
9/16" wrench
I started by removing the end links one at a time with the 3/4" wrench. Here's what it looks like after a year on the truck:

Using the 9/16" wrench, I removed the bottom nut and disassembled the bottom half of end links. The inside washers have to be inverted, otherwise the assembly is too long to use the original bolt. So I inverted the top inside washer, replaced the original sleeve with this:

I inverted the bottom inside washer, reinstalled everything else just as it came off, and loosely attached the bottom nut:

Reinstalled on the truck and they are good to go. Overall, I gained @1" inch of length, and they are slightly more rigid because of the nipple I used.
Back on the truck:
