Hello all new here and need some help please!! I am looking to find out the chain size for my 81 iron head usually there is a number stamped on a link, but I cannot see any number at all. Length would be something I would also like to find out. I cannot seem to find this info anywhere. I have looked at a # 50 size chain(the number stamped on the link) and that looks really close. I think it´s a 50 or 60. Please help!!! Thanks