This prompted me to look at my 1971D (11 total) and 1972D (45 total) peg legs.I searched the 20 74D peg legs that I have (3 in PCGS holders and 17 raw). I found three distinct MM placements (see photos). The "low" MM accounted for 15 (75%) of the peg legs, the "mid" for 3 (15%), and the high for 2 (10%). Interestingly, the double talon head appears on all three of my 74D peg leg Ikes with "mid" MM placements!
1971D: 4 distinct MM placements. The distribution to the different MMs was: 6,3,1,1 (see photos)
1972D: 4 distinct MM placements. The distribution to the different MMs was: 24,16,3,2 (see photos)
Of course, there may be more dies (MMs placements) out there, as the 1974D thread seemed to bear out. On the other hand, this may be it.
It is unknown how many peg legs each die produced. Dies could have been pulled at any time. However, the 1972D data does suggest that two dies may have been left in production longer than others.
I did not examine each coin for addtional die markers, nor did I evaluate for the relative die state of each coin.