Here is a photo I have had saved for a few years. This is purportedly an original factory placement. I believe the FAM also has an illustration for the placement. I bought the one on my wall hanger from Jim Carter I think, it looks to be very close?
https://www.flickr.com/photos/advance-design_parts_co/19563024146/in/album-72157631866985745/
https://www.flickr.com/photos/advance-design_parts_co/8590152491/in/album-72157631866985745/