Buzzer & Chime Modules
The large black one in the lower L is a true chime module
used in '90-96 trucks. The smaller black one above it is a buzzer, and they're interchangeable even though they perform differently.
The top center white one is probably from my '83 Custom. The others are older. Note the lack of the small terminal on the top L white buzzer. The top R black one might be from an import.