My carpet is not original, so take this with a grain of salt. I have no idea if it was made from the original pattern.
Tucked under the back seat is the way mine fits. If it wasn't under the seat it would move all over.
I also tucked the sides under the sill plates. I'm pretty sure the 55-56 models were not tucked in by the sills, not sure about 51-54. I prefer it tucked regardless because it keeps the carpet in place and looks clean.
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