he holes in my 68 convertible and my friend's 69 convertible are in the same vicinity as the one pictured in the camaros.net thread link posted by Sauron327; however, the hole in that thread had a keyhole notch on one side. The holes in our two cars are 1/2-inch diameter round without a keyhole. Attached is a picture of the hole from my car.
Both cars have original pans and the holes appear to be factory...there's no indication of a punch or drill being used. Besides, how come a March-build 1968 and an April-build 1969 convertible would have identical holes in identical locations in original pans? They have to be factory holes. I'm wondering if the hole has something to do with convertibles having hydraulic pumps that could leak or rear rain gutters that direct water into the quarters?