Bought a 2015 Mazda CX-5 and needed a cup holder extender for my large Nalgene water bottle, but all the ones I could find wouldn't fit all the way into the CX-5's cup holders, and would therefore fall out. These spacers did the trick, and I would definitely recommend them to everyone--not just Mazda owners. I tried looking for a generic version of these spacers on Amazon before ordering from this site and I couldn't find anything similar. They should fit any car whose cup holders are larger than 2.5 inches.
These come in handy for smaller cups so I ordered some more to have on hand. Quick delivery!