I have a set of hood springs that the guy I bought my 72 Lemans conv. from gave me. The front clip was off the car. But, they are marked 68-72 GM A body. He got these from a friend , because I asked where the hood springs were and he didn't have them. I know I've read not to use the heavy duty springs on the GTO hood. I was curious if these would not be correct. Does anyone know how to identify by spring wire diameter or length? Thanks.