Petco or Petsmart I mix em up
KennelAire makes a hard wire mesh unit that is made in Kansas, USA.
I am using it and it is fairly easy to remove the whole unit for when I want that flexibility. It will fit in the rear cargo area and still allow usage of the pull out cargo cover. (Must remove rear headrests)
Petco or Petsmart-take a lookie see. About $65 or so.
I added a number of zip ties to mine to keep rattling to a minimum but overall it is a better design than those "curved bars" that are an invitation for our pets to stick their head between.