There's an excellent hard cover book out by Guy Fay on AC tractors. (1933-1957)It's a wealth of info on all the Models AC made. Also has lot's of pix on decal placement, options, wheel/tires, and so on, all taken from original AC documentation. Full color too! My wife bought it for me last year. I think she picked it up at a Barnes & Noble book store. I'm always in that book for somethin'...Get yourself one, it's tough to put down. You probably can find it on this site..