The White/GMC WXR uses a 1157 bulb size for the front side marker and a 194 bulb size for the rear side marker. The replacement chart covers 1993 to 1995 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 White/GMC WXR uses the 1157 bulb for the front side marker position across the 1993-1995 model years.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W filament configuration, and meets ANSI standards for the US and Canada.
The dual-filament design of the 1157 means it carries two separate filaments within a single envelope, each operating at a different wattage.
The BAY15d bayonet base features two offset pins, which physically prevents incorrect single-filament substitutes from seating properly in the socket.
The rear side marker position on the 1993-1995 WXR uses the 194 bulb, a miniature wedge type in the T10 form factor.
The 194 is a single-filament bulb rated at 12V and 3.78W, also conforming to ANSI standards for the US and Canada.
The T10 wedge base of the 194 relies on the bulb's own lead wires to make electrical contact, with no separate metal base or pins involved.
The 1157 and 194 are not interchangeable; the front and rear side marker sockets on the WXR are designed for physically distinct base types.