I've talked with Linda extensively about her lettering. She said someone jus walked up to her and "gave" it to her at an alt car show. There is an outside chance someone can find the supplier but I ultimately have chosen a different route.
I mentioned the current placement is a bit cluttered being so close to the TESLA logo. She said Tesla does not like it.
I suggested that she move it down to the bumper for clarity. She wishes she had done that. She is a proud EV advocate and has even talked about putting "Electric" on both sides of the car.
It's also important to note that her letters are 3D. The are plastic chrome and protrude out maybe 3/16 of an inch (further than the TESLA letters) That's why they get that highlight shift as you or the car moves through reflecting light and shadow. They are really nice and I would recommend them to anyone (if they can find the maker!).
I have just opted for window placement and 3-D chrome lettering seems silly on glass.