The Buick Skylark side marker requires a 194 bulb size for the lighting components located on the exterior of the vehicle. Data for the specified bulb covers the range from 1996 through 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb is the dominant fitment across the Buick Skylark side marker specifications, appearing in both front and rear positions across the majority of model years covered.
The 194 is a T10 miniature wedge bulb rated at 12V and 3.78W, conforming to ANSI standards recognized in both the United States and Canada.
The 194NA shares the same T10 wedge form, voltage, and wattage as the standard 194 but incorporates natural amber-tinted glass, which produces the amber color at the lens rather than relying on a colored housing.
The Buick Skylark front side marker positions for 1968-1970 and 1989-1991 specify the 194NA, meaning those model years require the amber-glass variant rather than the clear 194.
Because the 194 and 194NA share identical physical and electrical specifications, the only functional distinction is the glass tint, and substituting one for the other will affect the emitted light color.
The 1978 Skylark front side marker departs from the T10 wedge fitment, specifying instead the 1157, a dual-filament bulb with a BAY15d bayonet base rated at 12V and 21W on its primary filament and 5W on its secondary filament.
The 1157 bayonet base is physically incompatible with the T10 wedge socket used by the 194 and 194NA, so the 1978 front marker housing is not interchangeable with those used in other Skylark model years without socket modification.
The 1971 Skylark front side marker specifies the 97 bulb, a single-filament BA15s bayonet-base bulb rated at 12V and 13W, described as a variant of the more common 1156 type.
The BA15s base of the 97 bulb is a single-contact bayonet fitting, distinct from both the BAY15d dual-contact base of the 1157 and the wedge base of the 194 series, making it incompatible with sockets designed for either of those types.
The 1971 rear side marker position specifies the 1157, while the front of that same year uses the 97, indicating that the front and rear marker sockets on the 1971 Skylark are not interchangeable with each other.