I think I used the 12x24, but I pieced my fogs and the grille together. I think that is becoming an issue because I can see where I matched the lines up. I plan on redoing it all this spring. The vinyl on the doors shrunk in the heat, however it didn't anywhere else.. I tried really heating and stretching the next batch on the door strips and it shrunk worse. I am at a loss, but am going to try again on the doors with virtually no heat shrinkage or stretch. It's been hit and miss, but I like the look too much to not keep at it. I've tested products like duplicolor black chrome, another similar product, and plastidip smoke, nothing even remotely close to the class the vinyl gives... it's a love/hate relationship.