I am about to acquire a 74 Dart Sport /6. It has manual drums all around. Looking to upgrade the wheels to 15" but I have no idea if I have 5x4 or 5x4.5 Bolt Pattern..Does anybody know? I won't have the car for a few days so pulling the wheels and measuring is not an option at the current time. Also what backspacing and tire size make the most sense to fill up the wells? Thanks for the help in advance.