Here is pic.. The problem is that the rear of the coupler has been mashed upwards on the street side. This won't allow the new pawl to slide in. I believe a careful filing will allow new pawl to seat.
The old pawl latches behind ball because it is worn "just enough"... One of those "wear fitmemt" things we see sometimes.
Thanks for encouragement to get better pics. That saved me getting out the BFH and wailing on it.