You asked for it and we listened...After much research and design we now offer the following new O-ring caliper. O-ring calipers are not new to the market just new to Lonestar. Instead of using the Lip Seal that came from GM these calipers utilize the O-ring seals and O-ring pistons. Each one is pressure tested and stamped. Calipers are available with brand new Delco Moraine castings licensed by GM. If you carry both Lip Seal and O-ring calipers now you can buy them all from Lonestar. Remember to buy from a company that supports you the wholesale dealer and stop buying from those retail manufacturers that want to steal your customer. Keep this in mind when choosing a supplier. Stop supporting your competition!!