The C&C Cavy GRAZER (a 2x2 grid-sized kitchen area) works well in XL or Jumbo-sized C&C cages. It's a perfect place to put your Hayware or even large loose hay pile. This size is good for 3-5 adult guinea pigs. Note that ramps don't quite clear the edge of a grazer, so you may need to do some landing adjustment if needed.
When combined with the Cavy Canopy and Backsplash (in our Kitchen Suite combo), it creates a cave-like private area giving guinea pigs the sense of security the need and like, which in turn, encourages its use while helping keeping the rest of your cage neater and tidier.
The Cavy Bistro will NOT fit in any size loft.