I just received my collar from 5.7 (Thanks Zack) and after about 20min with the dremel, it fit like a charm. I didn't even have to cut the ears off, they fit right over my oil pan like it was made for it.I used the same one that came with the truck and had to retrofit the same so it would fit. So if you have yours get the grinding wheel out with a thin blade and cut the ears and slowly retrofit the same. You will like how it comes out.