The decals are specifically sized to fit 3d resin prints of Ghukek's Miniatures ship designs at 1-1200 scale. They are very large decals. They are printed on white background paper and need to be cut out prior to application. Detailed application instructions can be found here:
 
Application Instructions
 
I have not tested the decals with any other manufactures / designer's ships. It is highly unlikely they will fit without moderate to significant manual alterations.