Assuming your swingarm is chrome, why not just sandblast it and repaint it black like it came stock? Finding a chrome one for an '82 will be a mission, for sure. If you buy a newer one as suggested, it will fit, but you'll have to buy a new chain guard, too, and take it off every time you change the oil. The '82 had a 2-piece chain guard (with different swingarm mounts) so the front part could be removed easily to get at the drain plug on the oil tank. From '83-up, the oil tank had a drain hose on the other side, under the battery box, and a 1-piece chain guard.
If it ain't broke, don't fix it.