Have seen the same. The shirts they're attached too look more convincing, too.Manchester United; seen a number with the logo in black or white outline and no gold filling.
Have no idea what the Premier League regulations are but it's difficult to believe that the massive logo/type in the earlier post is 'legal'.
What I really don't understand is why Chevrolet would want to sponsor Manchester United. Chevrolet Europe was started in 2005 to try and sell rebadged Daewoos, failed miserably, and is closing down next year. Assuming the closure was at least a possibility when the deal was made, it seems an awful lot of money for the US EPL market (who I'm led to believe are all coastal urban hipsters who ride fixed gear bikes, and are unlikely to be interested in buying a Silverado).