I have a 71 stage 1 and need a set of original heads. My body was built 12D, and it is a 71 model. I believe what I need is a late L or M coded set of heads. I just need something to match the 12D body. This is a 71 that was built in december of 1970. Thanks very much. My email is MATTL38829@yahoo.com and my cell is 662-416-0900.