I have mine open right now (but I'm at work). I'm putting in 3" 'Porsche 4 LED' that are 3" round. Don't do it. Stick with what they are selling on this thread. I'm having to modify my reflector bowl and it is quite painful. 7" round sounds huge. I spent 4 hours yesterday with a dremel reshaping the reflector bowl to get one retrofit to fit.
The problem is the bowl is concave, and when you go to put a large diameter retrofit in there, the sides of the bowl keep the retrofit from sliding all the way in. Then, the threaded back of the retrofit won't make it through the back of the housing.
I have pictures, I can probably load them up later.
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