[HO455]

The first picture shows an unmodified and a modified guide bracket. To get one side to fit up properly I needed to reposition one of the vertical wires in the foam supports (Photo #2 blue arrow.) There will be more on repositioning the wires later.
Once the guides fit in place I scribed a line to mark the center of the top of the bar where the head rest guide brackets mount. Then I held the guide brackets in position and scribed the holes the plastic guides fit into. With a limit of measuring I figured out where the center of each guide hole needed to be. After center punching and pilot drilling I used a 5/8" hole saw for the basic opening. (Photo #3) The guides are an odd shape that required me to use a die grinder to get the correct shape. (Photo #4) The holes in the Ford seat frame have at least 1/16" of play so need for much accuracy here.
When everything is done it looks like the last photo.
Sorry for the poor quality of some of the photos I just can't seem to get the camera on my new notebook to work as perfectly as my old one.