I updated the main checklist with the two that I didn't have that you brought to my attention. I do plan on adding to the list ones I know about, but don't own, but I have been very busy lately.
It seems that there are some that come up often, but there are some front back combos that don't seem to be that common. Again not an expert, so I am only surmising that the ones with the "Also look..." backs are harder to find.
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