This is a page I tried to compile combining all the Muranos with aftermarket wheels/tires 18" and up. I haven't updated it so I'm sure there are more Muranos out there with aftermarket wheels now. This should help you figure out style (chrome vs. silver) 40, 45, 50, 55, 60, 65 series tires.
Nissan Murano Wheels Gallery (FreshAlloy.com)
I didn't get my wheels from Bigwheels.net, I got it from a local shop ShowStoppersUSA.
On a side note...
Right Front Wheel
Right Rear Wheel
Driving on the freeway I had a mishap recently with two of my wheels running over a metal rod about the height of a street curb. (so did seven other cars that night.)
Outcome = bent wheels and ruined tires, suspension was okay.
The good thing is my tires were insured through a Discount Tires after a previous mishap. Unfortunately, I had to order two new wheels.
ShowStoppers priced me $590.00 for two wheels (and that's a discounted price.) Ouch! Luckily I saw my very same wheels on Ebay for $550.00 for 4 wheels Brand New!!!... Fortunatlely no one else bid, so I won the bid on the wheels... Now I have 2 extra wheels just in case.
And the store I won the wheels from is
www.WheelStudio.com
I think this store offers free shipping.
Good luck with your choice of wheels and get free replacement road hazard warranty on your tires if you can. Post your pics in the Wheels Gallery when you get your wheels.