Ratpin, a couple of things to consider: the panels I used (picked up at a swap meet) on my 66 were designated 60-66. they looked exactly like the ones you linked for 60-66.
1. the "dimples" for the body mounts are located differently in the early years (60-62). notice that they list an "original" style floor panel just for 60-66. I had to relocated the dimples an inch or so.
2. the panels I used did not have the proper depression shape stamped for the transmission tunnel, which complicated the attaching in that area. it appears that the original-style ones in your link do
nothing that can't be worked around. this stuff isn't going to fit perfectly anyway, but, depending on where your rust is located, you might want to check out the full length outer floor panels which have a much better shape up front and attach to the original flange.
http://www.classicparts.com/1960-66-...info/45%2D933/ I can't tell from the picture in the link you supplied if the original style floor panel has the correct flange, I know the one-size-fits-all 60-66 panels I had didn't.