Cut the holes to fit the LED boards in the r/h wingtip. I had to modify the outlines I had drawn yesterday, but not much. Busted a dremmel wheel shortly after I started and had to run to Ace for a replacement. Abrasive wheel in a dremmel is the way to go on this. I think the RV9 boards are going to work okay in the RV7 wingtips. There is a gap between the two boards. but I'll either just paint the whole thing to match the wingtip or go with a strip of reflective tape or something to fill the gap. Saved myself a hundred bucks by buying these used, so it's worth a little manipulation to make them work.