I have a 18" MOBIL Mobilgas Socony Vacuum Pegasus Sign Double Neon Wall Clock. Had it for a long time. Never even got a chance to put it up in my garage. Sadly the outer blue neon bulb was broken. Would by chance anyone know where I could get a replacement bulb ? Tried searching around on the internet and have had no luck. Any help would be much appreciated. Thank you. John B.