The rear window channel has a threaded stud that is screwed in after the channel is installed in the car. The purpose of this stud is to prevent you from cranking the window too high and allowing the channel from coming off the regulator. This probably what your extra bolt is used for. Look...
I just replaced the rear window glass in my 38 2 dr sedan. I assume you are talking about the side window guides. They can be a pain to get out. I think it would very difficult to remove them without removing the glass. To remove the glass you first should remove the inside window frame...
Need two headlight buckets with reflector mounting brackets for 38 Deluxe Sedan. My lights were converted to seal beams (in the fifties) and I want to convert them back.