My truck very rarely gets cleaned inside, but I've noticed that the carpet actually cleans up better than the ACC vinyl did too. The dirt will vacuum out of the carpet. The dirt would not vacuum out of the vinyl. A damp rag wouldn't get it out and even a tire brush wouldn't touch it.
I would do a spray in bedliner on the floor before another vinyl floor. The vinyl floor had a texture very similar to a very rough bedliner. Say for example you were removing one of the nuts for the seat. If the stud was fairly rusty and you were pulling on the wrench pretty good when the nut broke loose or the wrench slipped off of the nut or whatever and it caused you to drag the back of your hand across the flooring quickly, its rough enough that the flooring will draw blood.
If you set the vinyl flooring out for an entire hot day in direct sunlight all day, you might be able to get it to almost fit. Mine sat in the sun for hours and I still spent hours with a heat gun trying to get it to fit and was never happy with it. The shape is too small around the front of the transmission tunnel and too large at the rear of the trans tunnel (well, closer to the front of the seat, behind the shifter), so you get wrinkles in the front and then terrible looking fitment at the rear. It also will not conform around the floor braces at all. If you cut the flooring right down the middle to widen the front of the trans tunnel and then narrowed up the rear of the trans tunnel, you might be able to get it to fit.
I would look for an OEM one in good shape, but I think we both know about how likely that is.
If I were you, I would either do a spray in bedliner instead of carpet or a carpet kit with rubber floormats on top, depending on how fancy you want to be.