Do you mean the Kahler kind? Are you replacing one or installing a new one? If installing a new one, on what bass? They can still be purchased through Kahler and you can get left handed models too (I need a lefty tremolo arm for my Guild Pilot soon), but you need to make sure you get a model that fits your bass. Otherwise, check on ebay for a used one, either left or right, and just replace the arm with a lefty specific arm through Kahler (that's what I'm doing).
http://www.kahlerparts.com/Other_Pages/Parts_Finder_System.htm
