I wanted to replace my utility rear door panels with the standard rear panels so that I could better hear the rear speakers. I could not find a cheap set so I decided to see if I could cut a hole in the door panel. I removed the rear door panel and found a surprise. Ford had molded a speaker star pattern consisting of 28 - 5/16” circles into the backside of the door panel that matches the speaker location. After removing the panel I plugged in my Harbor Freight Wood/Soldering tool with the pointed tip. Then I centered the hot tip in the middle of each of the 5/16” holes, making a small dimple. Now I took a 1/8” drill bit and made the pilot holes from these dimples. After the pilot holes were drilled I took a step drill and carefully drilled out the holes to match the 5/16” template rings that Ford had molded in place. I thought about covering the back side with speaker cloth but have not done this yet. Then I reinstalled the door panels. This mod greatly increased the rear speaker volume and has the looks like an 80’s style factory speaker. I may later drill these holes larger using the step drill.