Coastie, yours look EXACTLY like the one I bought at WalMart a few days back for almost $5 (I bought one).
And, mine didn't fit.
It did "just" slide under seat, but as I pushed it back it hit a raised bump in the floor where the rear of each seat fastens (about 3/4" rise), and that kept it from going back any further. It made the front 3-4 inches hang out under the seat.
If I had some that were the same width and height, but about 11" long, I would be happier.
Oh, another questions, jlevin75 asks about folding down the seats with these in place...why would that be an issue? Am I missing something?
TJR