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I'd forgotten about the tower shifting mechanism. From the parts break down there appears to be two of those clips on the reverse rocker. The retainer rings are as follows: are P/N 97513, a 5/16" retaining ring for the OD/3rd rocker and the two P/N 97411, 3/8" retaining rings for the reverse rocker in the tower housing. The two 97411 ones are the E-clip style and look different but the 97513 is an external snap ring. Ford/New Holland uses these part numbers on some tractors.
If a part is substituted, be sure it fits the pin well. A person wouldn't want anything to fall off again if that's what happened. If they are all still there then it's a mystery about where it came from.