They're from the first generation of Grand Cherokee SRT8. About '06 through '10 I believe. I bought them because I had hopes of putting a 6.1 in my '05 Ram some day, but I've decided against that and am selling everything I have the is 6.1.
I do know that the 6.1 CAR manifolds won't fit without modification to the manifolds and the car. The car manifolds swing outward as they go downward. The Jeep manifolds go pretty much straight down and I think they'd fit, but can't guarantee it. If you give me a number to text a picture to, I can do that.
