Here is what I wrote about 61-64 convertibles and works for Hardtops and other models -for a 63 Convertible floor work
remember that those floor pans do not have these items -and you have to transfer the items to the new floor pan from the originals
gas pedal studs and plate with them
U shaped diagonal braces under the front floor pans
back seat springs mounting brackets (there are 4 brackets) -convertible only brackets for upper seat springs - other models had bendable tabs
seat belt mounting nuts for front seat- 2 sets of 4 nuts
this is very important ---- your convertible has 4 extra frame brackets that are mounted to the floor pan braces -those mounting nuts need to be reinstalled to match the frame supports -
the nuts are inside the braces
your convertible only top rack brackets have to be removed and replaced to replace that floor pan in the back seat.
Also there are convertible only top cylinder mounting brackets (4 nuts welded on the brace under the front of the back seat) that have to be transferred or added.
If your convertible is a SS car you have bucket seat brackets, SS console brackets and shift console brackets(for 63 & 64) to transfer from the old floors to the new floor pan. 62 SS consoles have drilled holes in the floor pan to mount the console box
you need the drain covers for the drain holes -they are sold new if you do not reuse the original drain covers mounted with 2 hex head screws for each oval drainhole (8 of them inside the car and 2 in the trunk)
Another item -if you have bench seats or want your floor pan to be original in a SS car that has bucket seat brackets with studs welded to the top of the floor pan
Bench seat mounting brackets and mounting nuts
do not exist on repro floor pans -you need to transfer the brackets to the new floor pan
Paul
4 pictures from my hundreds of restoration pictures of 3 frame off restorations