Just my two cents. The HD adapters are not as stable as I would have liked. You can see in the photos that they are a little high and narrow. When the bike is sitting on them up on the jack, the lateral stability was not the best (bike can slip sideways by rolling off the adapters). I returned them and made my own with 2X4 blocks that were much more stable (and cheaper). Instead of the little black block supplied with the kit, I used a double layer of paint stirrers to support the right rear frame under the lip. I found it to be much more stable. And if you are purchasing a jack to lift a Dyna, the J&S jack is designed to fit without using adapters. I put a post on the jack thread about that.