64 was the last year for the single cut key (at least in Thunderbirds), so it sounds like you have a latch from that year. The ignition and doors are one key and the trunk and console are another on my 64. My trunk lock failed (as did the first replacement I purchased), so I no now need 3 keys.
I expect the latch itself is the same from 64 to 66, so only the key cylinder is different. I have never seen replacement cylinders listed, but is see no reason why you couldn't switch in the one from your old latch.
Looking at photos of the latches, I can see a release pin on the end of the lock cylinder. It may well be that removal is done following the instructions for the trunk lock.
It can't hurt to try it with your old latch (if you still have it).
Let us know, this is an interesting problem.
Terry
64HT
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