They would be Air Magic units I reckon, I have not seen them anodized gold before?? I have a similar looking set in my AD F-16, look near the same although my ones are anodized blue.... Air Magic are no longer in business as far as Iam aware. I would consider replacing nipple if possible, they are generally generic sizes so likely available, you could try Sierra for nipples if need be. JB Weld the new one in place and you should be right to go.... http://www.sierraprecision.com/
Awesome flying model by the way, still one of my all time favorites, absolutely ballistic speeds with a 30 lb thrust turbine...