Need help on Ghostbusters Ecto-1 Kenner Decals

Hi all,

Newbie here from Singapore. Need help to print the decals for Ecto-1 and 1A.

Saw the link here

but I am not sure what are the exact print size. Kept printing the wrong size…

and also need help on print size for the ERTL AMT Ecto.

Appreciate the help!