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E.M. Winston tubas were sold by Sam Ash in the 90's and I've acquired one recently. I've never seen valve guides like these in any other horn.

I don't need any now, but better to find some now than when I need them. Does anyone know if these are available anywhere? Pictures in link below....

https://photos.app.goo.gl/dRv878S6hBCK881r9" target="_blank

From what I am seeing, this is not a very active forum. Lots of lookers but very few responses. I'm in the same lifeboat as you. I seek information from experienced people but they remain mum.

If memory serves me correctly, those are weril valve guides. I had a 3/4, 4 valve weril and those look identical