If you're looking at replacing your rusted rockers it's going to be a weld in job. What I've done before and a lot of others is to cut out the rocker at the top and right in front of the pinch seam, then weld in a chunk of material like 3x5 tubing the entire length. It's a lot of prep and weld time but if you can do the work yourself or have a buddy that can help, well worth it.
We did look at building a bolt in rocker replacement but it just didn't seem like a good idea. Wouldn't be pretty difficult to make strong enough to handle the abuse and wouldn't seal up the inner rocker against the elements, mud, water...end up rusting even more stuff from the inside out. If steel prices are crazy in your area I can get you the 3x5 tubing to whatever length you need and even bend you up an outer hoop for it for cheap.
