Sway bars?

I bought one of those kits but have yet to install it. I thought it was such a good deal. I have a 1974 Duster but the kit I got was for I think 70-72. I figured they would still work. At the time they didn't have a kit for '73 and up. But after seeing "redfastback" answer I probably shoudl have waited. I know for sure the rear would be the same.