I just got one of the 1.4# small red extinguishers from Jegs ($99) that isn't corrosive if I ever have to use it on a nice car. It also fits in the center console in the Buick and it bolted the mount usign the factory 7mm head bolt that is already there
H3R HG100R - H3R HalGuard Clean Agent Fire Extinguishers - JEGS