Pontiac Grand Prix Dome Light Bulb Size

Additional Notes

• The Pontiac Grand Prix dome light specifications reference three distinct bulb types across its model history: the 211-2, 561, 562, and 1004, each representing a different construction and base design.
• The 561 and 562 are both festoon-style bulbs rated at 12V and 12W, sharing the same 44mm length and end-cap contact design, which makes them physically similar in form factor.
• Despite their physical similarities, the 561 and 562 are separate ANSI-designated part numbers, and substituting one for the other without confirming fitment for a specific model year is not advised.
• The 211-2 is also a festoon bulb but uses an SV8.5 base rather than end-cap contacts, making it incompatible with sockets designed for the 561 or 562 even though all three share a 12V, 12W rating.
• The 1004 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V and 21/5W, representing a fundamentally different construction from the festoon bulbs used in other model years of the Pontiac Grand Prix.
• The 1004 is noted as a variant of the 1157, a widely recognized automotive bulb, though its dual-filament and bayonet base design is distinct from the single-filament festoon types used across the majority of Grand Prix model years in these specifications.
• The Pontiac Grand Prix (1965-1974) used the 211-2 for most years in that range, with 1974 being an exception that required the 561 instead, indicating a socket change occurred within that generation.
• The 561 is the most frequently specified bulb across the Grand Prix dome light data, appearing across a broad span of model years from 1976 through 1996, with isolated exceptions.
• The 2004 Pontiac Grand Prix returns to the 211-2 after several years of 562 fitment, reflecting another socket or housing change at that point in the model's production.
• The 1962-1964 Grand Prix models used the 1004, which operates on a BAY15d bayonet base and is not interchangeable with any of the festoon-type bulbs specified for later model years.