Got a runner mat designed from minivans from Target yesterday. Bought it because I noticed that the striker covers on the floor between the 2nd seats were getting really scratched up from the kids getting in and out from the back seats.
The runner mat runs from a little before the back of the front seats to the front of the back/3rd bench seats. Width is perfect in that it fits between the seats without any gaps.
It is gray which complements the interior of my Silver. Cost is $20.