By Progressive. The 412 steel spring shocks are a simple, durable design that will improve the motorcycle's suspension performance for as long as you are riding it. The double wall steel body construction with nitrogen charged, multi-staged velocity sensitive valving gives you smooth, consistent damping. A five-position cam style preload adjuster lets you dial in your ride whether you're a light rider or heavy hitter. They have a chrome cover with black springs. Minimum 30 day lead time, special order. Fits GL1000. Pair.