I made a solid bar and two billet mounts for tnegiet (who I think is now banned, atleast temporarily

) and that is what I used for a while as well. Mine has come off in anticipation of the new MPAC siderack.
Tnegiet mounts:
Siderack:
I had them priced at $160 shipping included but the MPAC siderack may make these obsolete so I can budge on the price some on these last few if anyone is interested. There are solid 6061 aluminum, black anodized, and sturdy as can be, but you have to drill your own holes and mounting points etc. It's also up to to decide what you think is safe. It's your rig.
I really should get a bigger extinguisher, and knowing the crap that comes home on my clothes it should likely have a D rating. Mines a midsize ABC bling bling (chrome) sucker.