If you want to make it look nice get some billet tubing clamps designed to hold parts to a roll bar.
Here is one example, you can probably find others, I have used different ones for catch can vents, helmet hooks, shock remote canister mounts, camera mounts, mirror mounts, etc....
This one with some 1/4" aluminum straps, bent if needed, would do the job but you might find some you like better.
http://www.speedwaymotors.com/All-In-One-Roll-Bar-Accessory-Clamps,42491.html
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Just found this with a quick Google search, just a few bucks more.
There are many to pick from, probably some in colors as well besides plain, clear or black