I just finished replacing both sides on my 79. The sides I used were off of a totaled mid-eighties k5. Before you start get measurements on where everything will need to be when it is back together ( tailgate width for example) The hardest part about the swap is drilling out all of the spot welds. You need to make sure you plan out where you are going to separate the bedsides from the cab/rear floorpan. I removed the entire quarter panel along with the rear inner fender. When you open the doors you will see where the outer skin is spot welded to the door jam. You will need to drill all of those out. All of the spotwelds between the inner quarter panel and the floor will need to be drilled out. You will want to use a sawzall to cut some of the old sides off so you can get to the spotwelds. The job itself isn't difficult, just time consuming. It took me about two weeks of nights and weekends. You will need a wire welder and a sawzall. I took pictures of the whole process, I can post some when I get the pics developed.
