I have 2 new, never installed Hydrasorb shock units for PA-20, PA-22 and possibly others. Selling as I am upgrading to shocks so I no longer need Hydrasorbs. Unsure of the age of the bungees but I believe you can look them up by the color code. Univair sells the set for around $2,300 without bungees. Located in Homer, I can ship at buyers expense