Their number is 1 800 873 8731 for dynapar,could try Adams cause they use these on Schindler mods. If it's the flex coupling u have to be extremely careful when tightening they break easily can't find part number
In a pinch, you can use a piece of nylon or plastic tube available at any hardware store. It will work great and last a long time. I carried 1/4, 5/16, and 3/8 pieces in my work van.
