I just purchased a used clothes dryer. I knew about the 3 and 4 prong plugs so I made sure I got a dryer with a 3 prong plug to match my old dryer/outlet. But... I found out the configuration of my new dryer 3 prong cord (2 straight, 1 L shaped) does not match the old dryer/outlet (3 straight prongs). What is the difference, and what can I do - don't want to spend a lot of money. Thanks for your help.