416 Series Magnumatic Air Shocks by Progressive. Over the years this shock has been improved upon is absolutely the best crafted shock available. The air can is mated to the famous Progressive Suspension dampener units with the finest quality seals and bushings available. Is the perfect choice for the touring rider who carries a varied load. Easily installed airlines and fittings, however, some bikes require an adapter kit (Part 30-5086 $22.95) to connect to the stock compressor or fill valve. Fits all GL1200s. Pair.