I'm ready to install new wheels and tires on my '69 spider project. I want to use 7X15 Minilite rims and 195x60 tires. I don't know the proper offset and backspace measurements. I'm hoping that someone can give me the correct measurements so I can order the correct wheels. The car has an Alfaholics fast-road suspension so it's 1" lower that stock. I'll appreciate any help.