I just switched from Mobil 1 oil filters to Napa Gold. I have a Silverado with a 5.3 liter engine and a Camaro with the ls1 engine. The Napa guy gave me the same filter(1042) for both engines and I noticed that the Napa Gold 1042 was the same size as the Mobil 1 filter (107) for the Camaro but the Mobil 1 filter for the Silverado was quite a bit bigger(longer) then the Napa. I also remember the factory filter on the Silverado was bigger(longer) also then the Napa Gold. Should this matter at all that it is smaller or could he have given me the wrong filter which I doubt? It fit fine but sence it was so much smaller(shorter) I barley had enough filter left to turn as the end of the filter does not stick out much using the Napa! Thanks for the info!