I started this Post September 28th 2019 and just now solved my issues May 8th 2021.
After watching You Tube video after video I went for a pair of 50 Second Element Extinguishers.
They tuck in with one behind each of the seats..no mounts no drilling no installation no loss of space for something I hope I never have to use.
The 6 Point harness issue was solved some time ago.
Thanks to All who helped.