And this is for an '86 302 with a/c...
I got it from
www.autozone.com, I just had to register for free and I entered 1986 Ford Mustang 302(I didn't know what year your car was for info) as my car and after I was logged in, I clicked on "Repair Info", then clicked on "Specifications", then on the next page, clicked on "Specifications" again, then clicked on "BELT ROUTING (SERPENTINE BELTS)", then clicked on "with a/c" or "without a/c", and finally clicked on "View Diagram".
Hope this helps!