Got some stuff I need to mount on my cage and wondering what is best and why. Speakers: they are like 6 X 9 box speakers with typical U shaped mount.. I was thinking they could be riveted by drilling hole in tubing and using a rivet gun to mount. Drilling a hole and tapping it for a bolt to mount the speaker, or drilling a hole all the way thru and running a longer bolt thru both sides. Fire Extinguisher: Same methods plus I saw a velcro attached foam holder. Not sure how that would work. Let me know what your opinions are. thanks.