While we don't yet have a dedicated case for the Novation Circuit Tracks, one of the cases in our PULSE line may be a good fit!
The dimensions I have on hand for the Novation Circuit Tracks are: (9.5 x 8.3 x 1.8) inches . If that aligns with what you have, I would recommend looking at the PULSE CASE FOR THE NOVATION CIRCUIT: 12.5 x 8 x 2 inches.