Quill stems?
 

Are quill stems available in different sizes?

I had mine replaced recently to bring the bars up and back a bit and I think they went too far. I can move them down easily enough but I'd like to try a little longer stem. I included pictures of the one I have which seems to work well. I like that you don't have to take the brakes off to remove the handlebars but I don't see any indication of who makes it. Does anyone know where these come from?

Thanks

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They're easy to find under brand names like Kalloy, Zoom, and Dimension using keywords adjustable+quill+stem. It's a good idea to use an adjustable stem to dial in your fit and they're inexpensive. Make sure the quill and bar-clamp are the correct size for your application. Quill stem risers can be short or tall but all of them require at least 65mm of minimum insertion. Here's a good stem calculator tool: Stem Comparison Tool | yojimg.net

I found one made by dimension wich looks just like my picture.

What do you think of those quill stem adaptors which let you use the more common type stem?

I think they're fine, I wouldn't hesitate to use one.

Yes.

OOdles of bike stuff you see for sale comes from Taiwan ROC , many importers will have some in their product line.

the names printed on the part are distributors brands, the manufacturers sell to many importers.