Gann gave me a set of vo's to try in the rf lid kit. The flange on the vo is large and doesn't fit in the rf lid kit without some modification to the speaker. Since these are not my speakers, I am not going to shave the flange off them. I tried some 1/2" spacers but that wasn't enough and putting a larger spacer will allow the speaker to sit off the lid so much that water can just fill your bag if it gets wet. I believe that the flange can be cut to fit the rf lid kit but its a damn tight fit. So with that being said, I just put the milles back in and im satisfied with those speakers for now..........