Partsam 5x Green Roof Running Cab Marker Light W5W 194 T10 6-5730-SMD High Power LED Bulb Application: for Roof Running Cab Marker Clearance lights T10 W5W W3W 147 152 158 159 161 168 184 192 193 194 259 280 285 447 464 501 555 558 585 655 656 657 1250 1251 1252 2450 2652 2921 2825 PC 175 2886X LED Type:6-5730-SMD LED High Power If the LED won't light up, simply flip it 180 degrees (reverse the polarity) No modification needed. Just plug and play. Easy direct replacement for all stock 194 bulbs