Try Wildcat Mopars. Even if they don't have it, they have a long list of vendors that you can check with and will shoot that to you via e-mail if they do not have it in stock.
You can find them out on craigslist from time to time as well. I would also check with barracudakid (he is on the other side of the country, but he usually has 69 parts and is a good member to deal with).
Also would love to see pics of the 69 that needs it! There was a solid yellow one that I was looking at a while back that needed a header panel due to a bump on the nose...could this be it?