I was cleaning up a set of mono leafsprings from a 68 camaro convertable. I notiiced some stampings in the springs. i had previouslt read that there were no markings on the springs, but now i have found very promiinate stampings in the spring. On the outside of the eye whhere the pressed bushing goes there is a "2" stamped very clearlly in both springs in the same location. On one of the springs there is a "G" stamped in the flat part of the spring near the smaller eye,the shackle end of the spring. Has anyone ever noticed these markings before?