I replaced the box sides of my 91 toy 4x4 and helped a pal replace his on an 86 toy 4x4. I got my box sides from cory at toyotafiberglass.com - these box sides fit really well and the hardest part is taking off the old sides. If you have a spot weld cutter and drill out the spot welds each side took me about 2-3 hours. When the sides are off grind with a flapper disk and then cut and grind the pannels to fit. I glued mine on and I'm very happy with it. I'd post a pic but I don't know how.

91 Toy 4x4 V6
85 Toy 4x4 22R