SoonishEV Water Bottle Holders for Rivian R1T & R1S

These work great. The parts are made out of aluminum and powder coated black. The opening fits up to a 97mm bottle (3.8189") bottles. In terms of the common bottles we granola-munching types like to use, the ones we know to fit perfectly are: A standard Nalgene SOME 36oz Yeti Ramblers 40oz Hydroflask Probably lots more too, that's just what we had on hand to test with! Installation is pretty simple. The rubber mat on the floor of the cargo area between driver/passenger seats is held in place by rubber plugs. Lift up until they pop out. Figure out where you want to place the cup holder (I prefer in the front so the camp speaker can still be removed, but they're angled so that they'll fit closer to the rear as well). Place the bottle holder in the desired location over the hold for the plug and pop the included plug in. Put the mat back down and... enjoy! These ARE directional. Between the plug + the weight of the bottle, these are extremely solid and your bottle is unlikely to move