After waiting for four stressful months on this valve that GM still can’t make, I bought a Lincoln MKZ. 
I will never buy another Chevrolet or any GM vehicle again. 
I will definitely be continuing this petition because this still remains an issue for many of the people who have signed! I’m sure there are even more people out there who are unaware of this petition or that so many others are also experiencing the same issue with obtaining this part.