I would like to get these rims for my 2005 Grand Cherokee in 20"

http://www.westkycustoms.com/product/XDROCKSTARBLACK

I would idealy just have bought SRT8 wheels but they are $2500-$3000 just for the wheels

anyway, I want to make sure that they fit perfectly as no matter how nice the rims are, poor fitment can make a car look like ****

I want them to be even with my fender, not recessed inward and not sticking outward (at all!)

Here's a bit of info for reference:

Taken from Streetjeeps.net

Stock wheels
"Backspacing = 6.25"
Offset = 50.8mm
Bolt pattern = 5x5 (5x127mm)"

and the SRT8's wheels are 20x10 in the back and 20x9 in the front

Thanks