Plymouth Neon Dome Light Bulb Size

Additional Notes

• The Plymouth Neon dome light bulb specifications cover model years 1995 through 2001 and reference three distinct bulb sizes across that span: 579, 578, and 211-2.
• All three bulb types listed are festoon-style bulbs, a form factor characterized by a cylindrical body with contacts at each end that seat into spring-loaded holders rather than a socket.
• Each of the three bulb types operates at 12 volts and 12 watts, meaning all model years in these specifications share identical electrical load requirements for the dome light circuit.
• The 579 and 578 bulbs both use end-cap contacts, while the 211-2 uses an SV8.5 base. Despite the shared festoon form, this base difference makes the 211-2 physically incompatible with holders designed for the 579 or 578.
• The 579 and 578 bulbs differ in length, at 44mm and 41mm respectively. This 3mm difference means the two types are not interchangeable, as a festoon bulb that is too short will not maintain contact with its holder.
• The 211-2 shares the 41mm length of the 578 but differs in its contact base type, so length alone is not a sufficient basis for substitution between these two bulbs.
• All three bulb sizes conform to ANSI standards applicable in both the United States and Canada, indicating standardized physical and electrical tolerances across those markets.
• The Plymouth Neon (2000-2001) uses the 579 bulb, which at 44mm is the longer of the two end-cap festoon types listed in these specifications.
• Model years 1996-1999 share the 578 bulb size, representing the longest continuous span of a single dome light bulb type across the Plymouth Neon's listed production years.
• The 1995 Plymouth Neon is the sole model year in these specifications fitted with the 211-2 bulb, a type that is distinct from all other years due to its SV8.5 base configuration.