Just an update on this.

I finally got around to "flipping" the tires from side to side, but it was too late. The Diamari's were pretty worn on the inside.
I went with Toyo's since they are OEM for the Toureg and Cayanne Turbo. Best of all, they were $530 with tax (8.25%) and installed!!! Costco was $375 for a single Diamaris + tax. The ride is the same and the Toyo's are quieter. We'll see how they last.

Just wanted to let you guys know there are other options that work well.

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2003 4.6is, Saphire Black on Black with Aluminum trim, Comfot Seats, Loading floor, Nav, TVonNav, Focal Utopia's in front, with Rainbow's in back, Helix 5 channel amp. ACS pedals, Aluminum steering wheel trim, X-pipe