If you mearure from the top of the fender to the top on the weel molding, you will find about an inch or more difference. 72 being 9 to 9 1/2 and the 73 at about 8. Also, I don't recall if this was mentioned, but the fender bolt holes do not match to the inner fender. Only a few will work. Blue fender is the 72. Because of this, I will have a 72 fender for sale.