"totally unnecessary...just swap your axle, spacers, rotors, and speedo drive...it's the same hub"
Thanks for the info. I'm doing this because I actually have the rim, and the existing rim and spokes are in rough shape. I didn't plan on doing this, but I picked up the rim (just the rim) from ebay one week when I thought I had concluded a deal for a GL front end minus the wheel and spotted the rim available for $25. The front end deal fell through, and here I am with a perfectly good aluminum rim that I understand is lighter than the badly corroded steel one that I'm replacing, therefore...