I have some NOS. I bought them for my 77 even thou it did not come with them. When I worked at Ford in the 90's I found one at another dealer and the other one at Carlisle. Just a month or so ago two were on Ebay. I was going to bid on them until my buddy reminded me I already had them. (I had forgotten about them. Not sure this helps you as I really don't want to part with them.
One is D3 and the other D4. The mounted pegs are different length but identical other than that. D3 has the shorter pegs.