OOOK,Chris. Proof is in the pudding.....and Carl said earlier he has them in his TRUCK (wasn't it '49) so that would rule out Panels only.
As I mentioned before, I THINK, I remember them on my old pieces we cut out because both of them were about rusted off right at the floor. I THINK!! The metal pieces are long gone.
Carl, looking forward to the pic of them in your truck....and this may have been relative to the assembly plant??? or model years??...either way it would make good sense to have them there.
Thanks again Chris for your pictures