Quoted from alexred:
I removed the bottom drop target from the playfield first to replace with clear. After removing the middle, I was able to replace that one and the top one with it still attached to the playfield. I used all existing holes and screws to mount the new LEDS. The top 2 with the existing standoffs work really well. For the bottom, I used the screw from the insert led that was nearby. It was the most difficult to get to sit right. It kept wanting to press into the drop target hole. A longer screw with standoff would be ideal to use instead. I hate c-clips! I have never been able to remove without something going flying, especially when they are spring loaded. Fortunately, the large speaker magnet right below catches most things that fly down. Great mod. Now there is one spare LED control to find a use for!
That final LED is maybe destined to get asigned for control in association with the Cooling Fan Mod!