Leaf spring recommendations

Thanks a ton guys. The thought did cross my mind that maybe the 9 in was longer. I do not know myself the differences in lengths. Since the front rims are 15x 7 I'll give that a shot and rotate them to the back as stated above. I'm also considering 14 rims on the front with 15 on the rear.
I learned that the previous rims on the car were 14x5.5 all around , unknown tire size. All said and done, I think what I'll need is a tread length less than 8 in. And getting the proper offset.