Just by looking at them they are totally different. Not just by caliper location..see pics attached of my kelsey hayes setup (4 piston caliper) and my 73-76 setup (one piston). Maybe it was wrong of me to recommend a new parts store but most outlets near me are full of 16 year old snots that do not know anything about chrome bumper cars....Ask me how I know this! Tried finding "bumper bolts" at a local Autozone and was told they dont carry those, its a dealer item...I found them in the store while looking around. Just my experience so I assume they are all like that these days.....Dont get me wrong a lot of the old timers seem to know what they are doing but lets face it, The computers seem to do all the work these days for the kids. Again, Not all are like my scenario.:thumrigh: