See jim's painting thread for pics of a late model tank painted to resemble an early tank.
Front and rear wheels are bolt on, the large rear drum seen as an upgrade. The TX used a different brand of rim, thought to be better quality than those used on the XS650? yes swing arm is beefier than the XS650 bolt on if you have drum rear brake, grab the chain guard too, the mount is differnt, but not 100% on that.