ray caldwell

Should be the same 72" track on all of them. Only changed a few sets of springs,but, I know that spring pin can be off by up to 1/2 inch.
Basic measurements are track width,front bushing bolt to spring pin,pin to rear bushing bolt and width of the spring.
If all these are good,you may only need to machine some delrin bushings if the years are too far apart
Then,you only have to pick out the wheels