What could have been mounted to my rumble lid ?

[TommyCoupe]

I've been putting patch panels in on the coupe, and one of the next items on the list to repair is the rumble lid. It's in decent shape, but I noticed that it has some holes drilled in on the top side.

Before I fill them, I was kind of curious to see if anyone knows what these holes may have been used for.
Is there some kind of accesory that would have been bolted on ?

Tommy-