I bought these off of ebay. They are called a 'car seat crevice box storge drink holder'. The are supposed to go in between the seat and the centre console/tunnel. It looked ok but not great. Got a bit in the way, especially on the driver's side.
I purchased two of these drink/cup wedges and cut the bottom wedge off. I screwed them to the outer part of the car beside the seat. It is down low enough for no one to get caught on or snap them off. It works a treat and doesn't stand out.