Mazda RX-7 Dome Light Bulb Size

Additional Notes

• The 168 bulb is the most frequently specified dome light bulb across the Mazda RX-7 model range, covering the 1986-1991 and 1993-1995 model years.
• The 168 is a T10 miniature wedge bulb rated at 12V and 4.9W, conforming to ANSI standards applicable in the United States and Canada.
• The wedge base design of the 168 bulb means it is retained by friction rather than a bayonet or screw mechanism, which is a defining characteristic of the T10 form factor.
• Festoon bulbs appear across several RX-7 model years, though the specific type varies. The 1979 and 1990 model years use 31mm festoon bulbs, while the 1980, 1982, 1984, and 1985 model years use a 36mm festoon bulb.
• The DE3021 and DE3175 are both 31mm festoon bulbs with end-cap contacts, making them physically similar in length, though they carry distinct part designations and are not listed interchangeably within these specifications.
• The 6428 festoon bulb uses an SV8.5 base and is rated at 12V and 5W. Its 36mm length distinguishes it from the 31mm festoon types used in other model years of the RX-7.
• The 13050 is designated under an OEM/Wagner part number rather than an ANSI standard, indicating it falls outside the common cross-reference system used for the other bulb types in these specifications.
• The 13050 is classified as a halogen bulb for a specialty application, which sets it apart from the incandescent wedge and festoon types used across the majority of RX-7 model years listed.
• The 1981 and 1983 Mazda RX-7 both specify the 13050 bulb for the dome light, making those two years distinct from all surrounding model years in terms of bulb technology and part classification.
• Because the RX-7 dome light specifications span four different bulb types across the 1979-1995 range, substituting a bulb from a different model year without confirming the socket type and physical format risks an incompatible fitment.