66 Barracuda manifold Vacuum fitting - looking for replacement

Sorry, not sure what this is called. And of course, I can not find to replace it

This is a the 3/8 NPT to hose barb manifold vacuum fitting - that connects the manifold to the performance (vacuum) gauge

Mine is old and some what damaged and I would like to replace it. But, I can not find anywhere. Most of the hose barb's diameter is to large. I found some listed at 6mm, but this should be closer to 3mm or 1/8th of an inch

Anyone know where to buy replacements or alternatives?

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