I found out the hard way that some rear disc kits are not designed for the staggered rear shocks on the 68-69's. The calipers need to be top-back on the pasenger side and top front on the drivers side. I did not notice this and had my calipers coated and non-returnable before I did. I ended up having to change my rear shock locations to make it work. with both calipers at the back, routing the parking brake cables was easy though. One small benefit for the hundred hours of work it took to change the shock location.