The Oldsmobile 442 front side marker bulb uses a 194 or 194NA size, while the rear side marker bulb uses a 194 or 1895 size. The replacement chart covers 1968 through 1971 production years with corresponding bulb size specifications.
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 most frequently specified type across the Oldsmobile 442 side marker positions, appearing in both front and rear locations for the 1970-1971 model years.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12 volts and 3.78 watts.
The 194NA shares the same T10 form factor, voltage, and wattage as the 194 but is distinguished by natural amber-tinted glass, which produces a colored output without a separate lens filter.
The Oldsmobile 442 front side marker positions for 1968-1969 specify the 194NA rather than the clear 194, meaning the amber coloring is built into the bulb itself for those years.
The rear side marker for 1968 specifies the 1895, a T5 miniature wedge bulb rated at 12 volts and 0.9 watts, making it a lower-wattage unit than the 194 series.
Because the 1895 and 194 differ in both T-rating and wattage, the two types are not interchangeable, and substituting one for the other in the 1968 rear side marker position would result in an incorrect fitment.
The 194 and 194NA share the same T10 wedge base and electrical ratings, so the physical fitment is identical between the two, though substituting a clear 194 for a 194NA would alter the color output of the front marker on 1968-1969 models.
All bulb types listed across both sub-parts conform to ANSI standards applicable in both the United States and Canada.