Can I add a third row to my 2005 Buick rendezvous and if so where can I find a third row
Some Rendezvous come with a third row seat, but in your case it seems that you don't have a 3rd row. My recommendation is not to add a 3rd row seat because the vehicle is not designed from the manufacture for hard adds on to any vehicle such as a 3rd row seat. Some aftermarket companies will add the 3rd row seat but keep in mind you may have to sign waivers because of the liability.
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