Oldsmobile Jetstar I Dome Light Bulb Size

Additional Notes

• The 1965 Oldsmobile Jetstar I uses a 211-2 bulb for the dome light, while the 1964 model year uses a 1004 bulb, indicating a change in dome light socket design between these two production years.
• The 211-2 is a festoon-type bulb, meaning it is cylindrical in shape and mounts by pressing its end caps into spring clips rather than inserting into a socket. It measures 41mm in length and uses an SV8.5 base.
• The 211-2 operates at 12 volts and draws 12 watts, placing it in the single-filament category suited for simple on/off interior lighting functions.
• The 1004 bulb uses a BAY15d bayonet base, which is a dual-contact base that physically resembles the common 1157 base. It is noted as a variant of the 1157 bulb.
• Despite the physical similarity between the 1004 and 1157, the two are not identical. The 1004 is rated at 12V with a 21/5W dual-filament output, and substituting one for the other without confirming electrical compatibility risks incorrect function or fitment.
• Both the 211-2 and the 1004 conform to ANSI standards recognized in the United States and Canada, classifying them as standardized replacements within the North American automotive market.
• The festoon format of the 211-2 is not interchangeable with the bayonet-base format of the 1004, as the two bulb types require entirely different socket and mounting configurations.