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Without seeing what bracket you're currently running it's hard to say.
When you want to put the extinguisher on the seat and also use a sub strap bar, the Brey-Krause items BKR9030 and BKR2030 make it really easy. With the BK stuff, no need for the Tequipment sub bar.
I already bought the Tequipment sub bar. The fire extinguisher bracket is from BK, the universal one. I guess I should just get the BK sub mount bar in the first place. Didn't know OE sub mount bar won't fit seats with BK side mounts if there's a fire extinguisher is also there.