I'm currently using Auran's USA 2 01-05 signals.  They're nice enough and easy to use but I'm not sure if there are signals for the left hand side in that style.  What is the use of USA 2 L01-03?  I don't think the L means left.  Yes, I know there are other signals out there but I'm using for now.  Any left hand's out there?  Thanks.