addco 751 sway bar for 1963 Dart
the addco bars are good, it's just the hardware that sucks. that fixed easily enough, though.
the helwig bar is very nice and installs easily. not much fuss.
i ran a quickor bar in the front of my darts (64 & 65) and it was great, although my LCA's were later 73's so all of the mounting i fabbed up. but the bar fitment was spot on.
the firm feel bar is nice too and the hardware is good.
no matter what you choose you'll more than likely have to drill mounting holes.
good luck!