There is a company out there called ididit which handles all the products you need to convert or shorten your steering shafts. They handle products by Borgeson Engerring as well and they have a web site too. They carry Rag joints, universials, shafts of different lenghts in double DD or other modified types of shaft.
You can access them on the net at
www.ididitinc.com or www. borgeson engeering.com