narowed 9 inch

i bought and traded my stock rear for this one but what i need to know is how wide is the stock rear from backing plate to backing plate so i can measure mine and see how much it has been cut

59.5 is stock, from the outside of the plates, I had mine narrowed 2 inches a side to 54.5 that lets me run 15x10 wheels with a 5 inch back spacing.

59.5 - 4 = 55.5