Thought this might help someone as I had to hunt it down. Found in the L663 Service Manual.

 

Thanks for posting! I still need to reapply mine after the PPF on the hood.

 

same reason as me actually !

 

I know when you purchase a set of letters from Powerful UK it includes a cardboard template, might make things even easier to line up if they are willing to sell the template separately.

 

This IS awesome. Great find. I would suggest when replacing the letters to only get one that comes with the placement templates anyway. Most come with a foam "jig" to help with the letter placement. Even with the measurements, that is gold on the install.