Originally Posted by KarTek
If it was me doing this, I'd find the closest size load extender to what you need, cut a section out of the middle of the tubes equal to the size you need to shrink the thing down to fit. Then, find some tubing that just fits inside the tubes you just cut. Cut a few 6" pieces, slide them into the cut off ends and then, drill and run some bolts through both pieces to create splices.
If the Summit Racing product doesn't work, I'd go with this. Except replace bolts with self tapping screws.