I assume that what you are talking about is what's called a "conversion quill". I've got good news and bad news.

The good news is that the lower portions come in sizes to fit 1" or 1 1/8" forks so be sure to order the right size (I assume 22.2mm). The upper portion also comes in sizes 1" or 1 1/8". I'd get the 1 1/8" because that's what most of the threadless stems are.

The bad news is that from looking at the pictures it doesn't appear to me that you're going to get very much vertical adjustability from using one.