I have this Inter A-Frame drawbar, which although basically the same as Richard's, does not have the 3-ribbed fitting at the end.
The Army Inter ACCO D-Rings are the same dimensions as a Chev Blitz D-Ring, the Ford D's being a thicker casting in the D section. My Inter A-Frame has D shaped inserts which go inside the Inter (or Chev) D-Ring to allow the cross-pin to make a slack-free connection:
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