adding a lights question

I have a couple or florescent lights I want to put in my garage. I currently have a single standard bulb light fixture installed. What do I use to connect a surface mount box over the existing recessed box?
Thanks
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Their are extension rings available for most common boxes. They have knock outs in the sides, sort of ceiling level for conduit.
Last one I did there was a knock out in the back of the surface fluorescent that matched the single gang box by adding a couple of screw holes.
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Thanks for the help!

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