I couldn't post pics yesterday so I just emailed, but I got another request for these pics so here they are. I had this hole covered in duct tape, so what you see around the hole is just the ugly residue.

It is about a 1/4" hole, about 3 1/4" above the centerline of the lower moulding, and 4 1/4" (horizontal to the ground) from the center of the C-pillar moulding. And yes, there's stuff in the way on the inside of the roof so you can't see the hole.

This is an original, unrestored roof/car, but it has been primered after the top was removed.

Hope this helps,
- Wade