Hey dj,
I saw one in Excellence magazine the other night at my brother-in-law's house, not sure if it was a BK mount. Although, if it's in Excellence magazine, it is most likely expensive as well. I just remember it had a single clip that resembled one of the buckles of a ski boot. But that's not very helpful for you. I will have to see if I can find the advertisement.
Actually, I bought a fire extinguisher last summer, but haven't mounted it either.
Let us know what you come up with or maybe one of the other folks out there have fabricated and / or mounted one that might be helpful.
