What are these holes for?

[Scott Johnson]

It`s been a long time since I tore down my burb, and I can`t remember what these holes are for. This is the front part of the cab above the windshield. The outer 4 holes are for the sunvisors. The inner 4 holes and the large hole in the center are what I`m wondering about. I thought the 72 models had the rearview on the windshield so I don`t think thats what it is, but maybe? The previous owner seemed to delight in drilling and cutting holes all over the truck, I think it gave him great joy. If these are holes he drilled, I will weld them up, but if it is for something I need I will keep them. Somebody please tell me what these holes are for.