Turn Signal lamps on Hood C4500 Chevy
 

I have an 03 Chevy C4500 that has turn signals that mount on top of the hood one on each side. It has yellow lens facing forward and red lens facing to the rear. I need the whole assymble with bulbs and all to replace the ones that are on the truck now. Someone put after market signals on and they are lights only not turn signals. When I have the head lights off they will blink but when I turn the head lights on they will do nothing. Not even the rear turn signals work. The buld in the light has 1 fillament and I think it is suppose to have two. I purchased some bulbs to attempt to replace the ones that are in it but they will not fit. The bulb that is suppose to go in it will not fit at all.