Anyplace in Newark NJ to get a Pete 579 used headlight?

Maybe call Elizabeth Truck. They may know where to find one.

 

These guys.

 

heavytruckparts.net used $625
Iowa80.com new $405
truckpartsinventory.com black $375, chrome $430
Not everyone may agree but for the most part aftermarket not worth it, cheaper for a reason, and most of the time it is much lower quality. OEM especially for anything engine or emission related. There are some exceptions. Say for Honda or Toyota Denso is the manufacturer and the same part can be purchased in a Denso box for less than what the same part is in a Honda or Toyota box.
I have read that others who have used aftermarket bulbs say that the life is nowhere near as long as the original. If something were Sylvania I would use it as they manufacture a lot of the OEM. Interesting to hear any specific feedback on the aftermarket which you asked about.

 

In some units the headlight assembly has multiple LED's for the turn signals and marker lights. Other lights are the same way. When one part or light/bulb goes bad (not a broken lens) you just can't replace a bulb, the whole unit must be replaced. Unlike when a headlight bulb goes out. So if one goes cheap and the whole unit must be replaced prematurely it's going to cost more in the long run.

 

Google truck wrecking yards in the area. Unfortunately, most of the wrecks probably kill the headlight buckets.

 

Clear flex tape will keep you going til you find something.
I've patched my swimming pool with that stuff and the pool was full of water