To be used an a 1975 they would require moving spring pads on housing on rear axle only. I think the front would stay in same position. On 1976 thru 1986 the frame widths are all the same. On thing that does change is that the wide track axles mount front shock on housing tabs instead of the spring plate. This also requires a taller frame mount be used or you will have almost no travel due to short shock length.Another cure for this issue is to remove the lower shock mount tabs and run standard pre widetrack shock system.