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From what I cab glean, TRF is the only one in the US carrying the correct inner sills, which I think they designed/commissioned. Earlier versions, which seemed to be the same from most suppliers, were plainly incorrect in several ways. I don't know if others have caught on yet.I am working on a 1959 TR3. I have replaced the floors, sills and rockers. All from TRF. I used the upgraded sills and found them very good. The floors fit well and did have the captive nuts already welded on. The rocker panels did require some work to fit them. But that could have been due to the car I am working on.
No help on the trunk floor. Also some cheaper panels do not have the captive nuts welded on, so check on this.
Charley
Please note, the trunk floors are different between pre and post 60k cars. Also, the floor panel from Moss did not have .... the tabs for the wiring harness.