Pop bumper cap yellow
Opaque yellow mushroom shape pop bumper cap for early Stern 4A-317 and early Williams 3B-7444 or 03-7444-XX games that have smaller pop bumper bodies.
Change pop bumper cap lamps to LEDs even if you don't chose to use LEDs elsewhere in your machine. This will prevent the pop bumper caps from incandescent lamp burn as the lamps age and overheat. A warm white LED (see related items below) is a perfect substitute for any pop bumper incandescent lamp.