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I am not aware of any business that makes replaceable seat covers for the vented or ventilated seats in your ZR. I think your best bet would be taking it to a specialty upholstery shop.
I've always liked those seats. I have black leather in my ZR and it's always fun getting out in the summertime with the back of your shirt drenched in sweat. A used set is generally around a thousand for the pair and you rarely see them come up for sale. I have the traditional seats with the separate headrest. I may get some new covers in the future and get the middle insert with a more breathable material to avoid the summer swamp ***. lol.