Microwave incandescent light bulb, 40 Watt. Has small screw in base. If the light bulb threads are corroded, or the bulb base is too large, the socket may also need to be replaced.
Screw, 8-32 x 1/2 phlps. truss hd.
Screw, 10a x 1/2 pan head with locking nibs
Strain relief, bushing