Dell 3000cn Parts

Hello.  
Does anyone know of any place that sells parts for the DELL 3000 series printers? Like the motor sensors? Or was RadioShack the last place and like the DoDo Bird they are just no more. After performing an online search, and presented with a company called Impact something dot com who said they had the sensor I was looking for, they then decided they did not have the sensor.

Thank you.
John