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I'm starting to suspect those sail panel seals are the same part on both G35 and 350Z, go down to Nissan and have them pull these part numbers and compare to your existing seal.
I know the angle is SLIGHTLY different on the 350Z but the rest of the dimensions look the same and it is flexible so I bet that's the part number they use.
Never heard back from the OP but you could probably drive down to your local Nissan dealership and look at the part numbers I listed a few posts up. Should be able to just hold it up to your door and tell if it will work or not.
Sorry, I forgot to update this.Life got busy. But I went to Infiniti showed them pictures and the guy said I had to buy a whole new mirror..... I Don think so. Based on the images here. they dont look to be apart of the mirror assembly.
A closer inspection of those seals may reveal that they are dried and cracked, and need to be replaced. Here's the parts: Driver's side............80833-CD000 Passenger side.........80832-CD000