You might be able to get this part thru a heating supply company. I used to work for a large old HVAC company that made their own duct work, and had a complete metal-work shop. We often made parts from scratch for older units.
Williamson af 02689 oil burner manual Asked Nov 11, 2012, 11:23 AM — Have a used williamson af 02-689 oil burner in garage.
I mentioned the flue collector because they were really bad for rusting out especially if rain water comes down the chimney. Call around to your heating shops and have the model and serial number from your furnace on hand. I believe Williamson furnaces are still being built. You should still be able to get this piece. Cakewalk sonar. The model number should be in the burner box area. Usually on the right side. Best of luck.