I believe the '62-'65 pans work.
Like Dave said, get in touch with Jim K, or Joe Suchy. They may have one around ?
View attachment 1277030 View attachment 1277031
I don't know if you could get enough strength with what you have there Mike.
Frame connectors with cross bars maybe, but, well...
I purchased a full floor from Kramer a few months back for one of my 64's. I was told by Jim's wife that they had purchased all the remaining stock from AMD that fit early B's. I also found out that it was Jim who worked with the original stamping co. to have these floors (and the other early body parts) made for AMD. When AMD ran out of the floors, they were not interested in doing another run of floors or ANY early B parts, which is why all the early B items in AMDs cat. are discontinued. I contacted AMD myself, and they told me that there was "not enough interest" in early B stuff, and "we will not be doing any more, because the parts just sat on our shelves" Jim, being a good guy, had a limited run of 100 or so floors done, but I don't know if any are left. I think he would be the best to try because besides the extra floors he had made, he has all of AMDs remaining stock for early B's if you need something else. He also might do another limited run of floors.(?) As stated by others, Joe Suchy is also a GREAT guy to deal with for early B items. He may have partial floor pieces.
Looking at your photos Mike, I think that you might want to go with the full floor if you can, as it has the trans tunnel. The install also might be easier. I live just down the road from you, and if your interested it cost me about $2000 CND to have my floor dropped to my front door. That included the floor, shipping, exchange rate and the taxes and duty.
Best of luck with your car!