http://www.bkauto.com/R_2225_BMW_Fire_Extinguisher_Mount_p/r-2225.htmHere is one built supposedly for the 3/4 series. It sticks out more than I'd like but its an option I suppose:
View attachment 10658
Two things, that is a B and not C extinguisher. So I'd suspect its not so good with electrical? Second, from what I can figure, I don't like either of those mounts(the one I showed nor the one by bkauto). They stick out too far compared to the official BMW mounts which are seat specific.http://www.bkauto.com/R_2225_BMW_Fire_Extinguisher_Mount_p/r-2225.htm
i posted this earlier that attaches to the button of the seat so it moves with the seat just like oem. after the bracket you can buy w/e quick release you like.
im looking at this and I haven't decided on a quick release or mount yet. I do like the oem style made by BKauto
install instructions said i dont need that. they provide some self tapping screws to the seatYes, those do look very similar. But for my at least, my brackets do not look like that. If that bracket fits your car, then it will -probably be a good option. There is a bracket and then there is a holder. The holders can probably be used with various brackets.
For example, these are the brackets prescribed to my E93:
View attachment 10660
The equivalent to that is the thing you showed me from BKauto and ECS. What I mean is, I couldn't use that bkauto bracket if I wanted to, apparently it doesn't fit my seat.install instructions said i dont need that. they provide some self tapping screws to the seat