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In Slam's 63 we mounted them to the fender. the difference will be less air wasted and a faster raise. If you leave them in the rear you have to fill the line between the valve and the bags just to drain it back out when you drop the car. Not sure what valves you have but I bought some "L" valve brackets and welded them to the angled bars from my front end to the fender. On Slam's he just got some circle clanps like what you would use to mount a pipe to a wall. Sorry i dont have a camera but slam may be able to get you some pics.

As for the tanks, do you know what pressure they will hold? Might want to be sure they can fill them with nitrogen first. I would take the bottle down to a welding supply and see first if they will be able to fill them with nitrogen and if so next ? would be what regulator do they have that will work for what you need.

If you just get a nitrogen bottle i would say that would be easier because you just get the bottle and a regulator that will do at least 400 PSI and some fittings. Another good thing about the regular nitro bottle is that when its empty you just do a swap at they store and get a fresh bottle. with the scuba tank you will actually have to have someone fill it then but it back in the car. Heard of scuba tanks being used but not sure what they were filled with.