there is on set there from a 70 340 duster with z bar to match and the linkage that connects z bar to pedals has brake light switch and the switch that i have no clue what it is,I think its like a safety thing cause I have always found them unhooked . the other three sets apear to be aearly a body and the only diffrence i see is the late a set has a clearance thing for the speedo cable