Mocambique-Amazone, that "poster" is actually a photo of a tee shirt my friend Aashish gave me. My entire summer wardrobe seems to be made up of track day related items!
Aashish got it from Heritage Racing and I think this is the direct link for the shirt. Edit: Oops, it looks like the link is for a baby outfit, but the copy (lower down) indicates that you can purchase as an adult tee shirt, which is what I have.
https://www.etsy.com/listing/4790241...home_active_31
Edit X2: Ooops x2. Here is the actual link for the actual adult tee shirt.
https://www.etsy.com/listing/2088697...-pv444-t-shirt
It seems to be a small shop, and I suspect they could find a way to make the poster up for you.
Good luck.