Just took a look at my 280 SL, VIN 12730 and it has both of the holes, the 8 mm and the 3 mm. Only the 3 mm on my car has a screw into the body. The other hole is just there with no corresponding hole in the underlying body work. It is the same on my 250 SL (earlier than Tyler's car) but the 250 SL is a complete redo, so take that with a block of salt. The 280 SL is mostly original.