I'm replacing some lights on the top of the cab and also need one replaced on the side of the dually fender. Anyway, it appears that you just replace the whole light fixture on the dually fender. Anyone done this lately?

 

Would Wally world carry these lights, including the dually complete fixture?

 

The DRW lights are DOT15 sealed units, you replace the whole thing. They are only a few bucks. It may seem a bit wasteful, but these sealed units last a LOT longer than other small marker lights since water can't get inside.

Your best bet for replacements is NAPA.

The cab top lights are removable. Pull the screws and take the light off the cab. Follow the wire to the light, and you'll see a little twist off fitting at the bulb. It's a 192 IIRC.

 

Oh, one more thing:

You can get LED DOT15 bulbs if you want to for $6 to $7 if you shop around online.