40 series vs. 45

[cjperry81]

I have a 65 Mustang that is on 2 inch drop spindles in the front and 2 inch blocks in the back. I just ordered 17's for the front and 18's for the rear. I wanted 40 series but the guy at the wheel shop says i should go with 45's. Does anyone have pictures of the different sizes on those size wheels so I can see the difference. Plus what is people's opinion? Thanks