We use these in our ACE 30.1 which likely has the same shallow “not cup holders” as the Challenger. The bottom smaller diameter section is a hollow extension to the cup holder section. I cut off the bottom section and then use Velcro to attach the cup holders to the bottom of the indendentation that Thor thinks is a cup holder. They work quite well.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1