With my Limited I received 4 mats total, all with anti slide posts. Driver, passenger, 2nd row driver side, 2nd row passenger. On the second row there is a ~1 inch gap between the two mats (a continuous 2nd row mat would not make sense with the Stow-n-Go seating). I received nothing for the third row foot area or walkway between the 2nd row seats but it's pretty roomy in those areas so just about any normal Walmart van mats (black) would likely fit and look okay. Chrysler sells Pacifica accessories and does offer a liner bin for behind the third row (for when the rear seats are up) to protect the bucket carpeting and another plastic liner option for when the seats are stowed. I'll probably buy both but they aren't cheap from Chrysler.
I am looking for different mat/liner options for when the 2nd and 3rd row seats are up vs stowed. When seats are up I want to protect original carpeting from foot traffic (and salt when we travel north in winter) but when stowed all 2nd and 3rd row seats are sitting below the cargo level so any possible liquid spills from pool chemicals, paint, pesticides, household cleaners, wet bags of mulch/potting soil/sand, trips to the beach, etc., etc., are going to be seeping towards those beautiful seats. My van is red with black carpeting and "Alloy" seats which means my third row seats actually have white carpeting on their backs which is going to look just great if I ever get a liquid spill back there that is not totally contained by a plastic liner of some sort.