Most of the time the Pieces that are replaced are the rusty areas if the patch piece s bigger than the rusty area then the patch panel is cut leaving as much of the original piece that is not damaged.I recently did the drivers flood on my truck and found even though they look the same there are little differences .I ended up changing more on the floor that I wanted to because the bead lines were off on the patch panel so cutting across the bead was not possible . The inner kick panel has lines that should line up with the lines on the door but they were off slightly as well.the inner to outer piece that I had was junk and had to be cut in several places to fit .the floor patch pieces have the toe area and if your floor is not rusted from the seat riser back the patch pieces should work .there is a fellow on YouTube carters auto restyling that has a lot of videos fixing these trucks and on the one video he points out some good imfo on the parts and fixing the areas that rust on these trucks although I have not seen a video of the floor patch but he also makes some of the parts himself.

1954 Canadian GMC 9300
"The Journey"
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