In my S197 had a 1lbs in front of the passenger seat until I put in the 15 - 17 Recaro seats, then moved it to the harness bar in between the seats. Have been doing a little bit of research on S550 mounts. Definitely going to use a 2.5lbs extinguisher in the S550.



There were two mounts like this to the seat, but can only find a pic with one mount installed.