I am working on a 67 convertible and the area of the floor where the top folds down (between the trunk and rear seat divider) had some rust. When I cut it out the hole in that piece was lost and the hole partially filled in (due to me not being carefull years ago). Best I can tell it's 1 3/8 inches in diameter, but before I paint I want to make sure exactly. Any help? Thanks.