They might be the same sellers that's listed on that ebay link because they're both from Michigan. Anyway, they have a picture of a white GX with the black permachrome oem wheels but it's kind of hard to gauge due to the angle of the picture. It's hard enough to find someone with black permachromes; I highly doubt you'll find one on a specific color, such as Tungsten.
I'm on my iPhone and it's hard for me to link it up to you because their website isn't so great. But yeah, go to said website and click "car photos". Select "Lexus" and I believe the GX is either on the third or fourth page. Hope that helps.