Headers question

What size front tire and wheel are you guys running with these Headman headers? Backspace and width of front wheel if known as well please?
I think my front tires are either 27" or 28", I can't remember off the top of my head. They are 4" wide Hoosier front runners. I can't remember the wheel back spacing either. I just reinstalled then today after being coated. Still prefer these to any one piece headers.