Red58
The pic helps. I thought that the missing piece would have come straight out from the air flow opening. Your pic shows that it goes up above the box, that helps me. Now I need to find it. I looked all over the net with no luck, you would think that someone is making that style box, and I should be able to get it from them.
Thank you for all your help.
I have posted a bunch of pics on photobucket of my 58 Apache under navycwo4 account.