A bit late, but stumbled on the thread, referring to the 50145 pads. These are a small pad that was used as filler at the outer ends of Bow #4. Over the rear curtain, under the top fabric, held by adhesive. Called out in the FAM's as just a "filler", but no deails as with most the pads and soft "pattern parts.
As noted in my document I would now add a strip of medium density closed cell foam there, as without it the top fabric sucks down a bit into the channel of the bow. I have info from Scott Halseth of NDP that the material was polurethance foam, and size was 4" x 3/4" x 1/2" thick, based on Ford drawings.
Not reproduced AFAIK, but pretty easy to fabricate.