I believe these are vectorized art. In which case they should scale to whatever size you need without loss.
Try reaching out to comboman for the raw file. Probably Adobe Illustrator. I have not heard from him in a long time so don’t let it hold up your project.
Have a chat with Scott at GameonGrafix https://gameongrafix.com/ He has done well for me and accommodates custom prints. Also prints on adhesive for applying to glass if you plan to do that.