Yes it sure does! My kids were sweating their butts off. I think the ac was designed for the r1T. With these the 3rd row vents blow directly on my three kids. I found I guy that makes them. Only 15 bucks. Worth every darn penny...
I believe so. I don’t have the file. I purchased it from https://jax3dprints.com/products/rivian-r1s-rear-vent-diverter-for-rear-facing-car-seat-third-row-vent. Was like 15 bucks per side. I can confirm it works great and my kids are never sweat balls anymore