How do I find out or decode 8 lug rims? Inside the drums there Are sets of numbers but I have no idea on what they mean. I've got a 66' I'm hoping to use them on and if they don't apply I'll try to use them on a 63' if they code out to the 63'/64' generation. I am aware that there are differences and the won't work for years outside their interchange range. Thanks in advance.