You can mount it under the passenger seat if the first aid kit isn't there already, or if it is, you can swap the two. Though the instructions do specify to only mount it under the driver's seat (presumably to have quickest access to it in case of emergency). They also specify which direction the handle should face depending on whether you have manual sport seats or some other seats (likely to prevent interfering with the seat adjustments). (Of note, the first photo that shows it mounted is incorrect according to the instructions. On that manual sport seat the handle should face the opposite direction. The photo at the end of the instructions shows it correctly).

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