The decals are scaled specifically to 1-6000 scale Figurehead metal ship castings produced by the good folks of The Last Square.
 
Since LS does not make a Casablanca class CVE you will want to use the Royla Navy Esscort Carriers which most closely resemble Casablanca.  This set is specifically sized to fit sku 2B47 Escort Carrier castings
 
Please click here for general decal application tips.