https://www.davesclp.com/store/p398/1970customplate.html
If your not happy with the aluminum one from that company, I can do one in steel with the correct stamping dies for a 74. I may be wrong but beliece they don't have the correct dies for for 6 digit plates. I'll only do one if the plates are registered to the vehicle already.
https://www.davesclp.com/store/p398/1970customplate.html