If you want a cast rear wheel with disc you need a wheel from a SR 500 or XS 500. You might have to change wheel bearings to allow the stock axle to work. If your looking for a cast drum brake only '81 SH models had them. For spoke wheels, disc or drum brake, the stock spoke wheels from the XS 650 will work. One must use the appropriate swingarm for the brake used. Disc brake swingarms have the brake anchor on top.