What year car are you referring to? You prabably are looking at Date cades. The codes are stamped into metal approx. 1/8 in. tall letters, should be a letter (probably R), a space and a 2 digit #(refers to week of build). My 11A -66 build '67(approx. week 44) has a T 43 trunk lid, a H 43 right door. and a H 42 left door. The rear quarters have been reskinned,(before I got the car) so sorry I can't help you there. Kurt gave me the info.(probably- R ##)