Yeah, I'm pretty sure its the panel that sits under the seat, its been awhile since I took that old floor apart and don't really remember. I built an a new floor for the truck but crosscut wanted to see pictures of the panel.
Thanks for all the help and I forsure will try it on my 29 and see. I tried it on the 31 Coupe and the lines didn't even come close so I know its not a 30/31 forsure.