Bloody hard to find part.
Do you have to old one??
Whats wrong with it? If it just needs regassing, then they are filled with neon gas. Im more than willing to attach it to my neon pump and attempt a refill for you. No guarantees on this, ive never tried to tip off a nipple on a display and weld to it, but willing to give it a go... but if its a regas thats needed..what do you have to lose?