The Mercedes-Benz SLK320 front fog light requires H7 and 9006 bulb sizes, while the rear fog light uses a 1156 bulb size. The replacement chart covers 2001 to 2004 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz SLK320 front fog light uses two different bulb types depending on the model year: the 9006 for 2001-2003 and the H7 for 2004.
The 9006 is an ANSI-standard single-filament halogen bulb rated at 12V and 55W, fitted with a P22d base, and is the standard for the US and Canada market.
The H7 is an ECE-standard single-filament halogen bulb rated at 12V and 55W, fitted with a PX26d base. Although it originates as a European and worldwide standard, it also carries approval for use in the US and Japan.
Despite sharing the same 12V and 55W electrical ratings, the 9006 and H7 are not interchangeable due to their different base types: P22d for the 9006 and PX26d for the H7.
The front fog light base type changed between the 2003 and 2004 SLK320, meaning a direct bulb swap between those model years is not possible without accounting for the differing socket designs.
The rear fog light on the SLK320 uses the 1156 bulb across all listed model years, from 2001-2004, making it consistent throughout the production span covered by these specifications.
The 1156 is an ANSI-standard single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which is a twist-and-lock style mount common in automotive rear lighting applications.
At 21W, the 1156 rear fog light bulb draws significantly less power than either the 9006 or H7 front fog light bulbs, which both operate at 55W.
The BA15s bayonet base of the 1156 is physically and electrically distinct from the P22d and PX26d bases used in the front fog lights, so no cross-position substitution is possible between front and rear fog light bulbs on the SLK320.
All three bulb types specified for the SLK320 fog lights are single-filament designs, meaning each bulb serves one lighting function rather than combining multiple functions within a single unit.