[Tom_in_NH]

So, waking this thread up. Looking at Techweenie and Clay-O's photos in this thread, you can see two sets of tabs protruding from the slots in the B-pillar, on what is assumed to be a pre 1977 car originally equipped with pop out quarter windows.

Now, its been about 30 years since I have removed a 911 pop-out quarter window, but I seem to remember that those tabs were tapped to receive the flex-hinge retaining bolts. This allowed those tabs to act as a clamp, securing the flex-hinges of the quarter window.

Those tabs do not appear to be present in the later cars once the spot welds are drilled out and the later B-pillar sheet metal removed, although the slot is certainly there. Which brings me to my question. What IS there in the later B-pillar that is sandwiching the flex-hinge of the quarter window? Are you simply running a sheet metal screw into an inner piece of metal in the B-pillar?