Check out this baby. 1970 e-bay Dart.
If you look, you can see the two slots in the rear bumper where a '71/up hook type jack would fit into. The front bumper does not have these slots. You can see in the pic of the jack that it's the correct '70 style that grabs the bumper from underneath.
It looks like it got bid up to about what he paid for it. Didn't meet the reserve, oh well... too bad.