Here are bunch of different sources for extinguishers, fire safety systems and mounts:

Extinguishers and Vehicle Fire Systems:

http://pitstopusa.com/b-4644-firebot...y-systems.html

Racing Fire Systems and Fire Extinguishers

http://www.speedwaymotors.com/Race-F...FbEBQAodjE1SWw

Fire Systems

http://www.summitracing.com/search/B...Extinguishers/

http://www.sstmotorsports.com/Firech...System_s/5.htm

http://amerex-fire.com/products/vehicle-systems/

Mounting:

http://www.hallmann-sales.com/heavy-...le-bracket.htm

http://www.fireprotectiononline.co.u...port-brackets/

http://amerex-fire.com/products/brackets/
Quick Fist:
End Of The Road Inc. - Home Of The QuickFist Mount