Everywhere i look online leads me to HID conversion kits and OEM replacement assemblies. Does anyone know where i can buy all chrome aftermarket headlight assemblies for a 2001?

Not sure what you mean by all chrome headlight assembly. Can you post an example picture?

I don't believe there is any after market headlights for the Bonneville, just stock replacement. What could be done is you could make them. I suspect he wants the black frame to be chrome, which if you pull the assemblies apart, you could paint the frame. They pull the assemblies apart to clear the corners as well.