Has anyone ever used the Global West rear leaf springs for there 69 or 70 Mustang? GW claims that you do not need to use traction bars due to their springs control wheel hop. They also claim that if you use the Del-a-Lum bushings, a rear sway bar is not needed. Anyone have any input on this? I was going to go with Mustang's Plus Grag A Trak mid eye leaf springs. Both will lower the car around 1". Thanks.