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No they both, [early] 71-4/73 and [late] 5/73-79, have the mounts under the [frame head] chassis.
What I mean is that on the early frame head there is only one set of holes to bolt the control arm to but the late frame head has two sets of holes (one on top of another).
The late bottom holes are never used and the late top holes are in the exact location of the early single holes. These are the holes that the control arm mounts are bolted into, see the picture attached of the late frame head and you'll notice I pointed to the set of two holes on the mount and the early frame head only has one hole here.
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