68-74 A Body Exhaust Tips Original Used
The 2nd-generation Barracuda and 1970 Dart all have rear valances, unlike other performance A-bodies. Because of the inward curvature at the bottom of the valance, the tips are different. The ones listed would technically fit, but they'd stick out like buck teeth.
For comparison, the 2nd-generation Barracuda/1970 Dart tips look like this: