This place has two guides for Juki machines, one is a #226292 swing guide, and the other is called a #107SG swing out guide CLICK HERE
This web site is really hard to navigate. To see a picture of these, click on "online specials", then click on "other". The put the word "guide" in the box to the left of "search", and click on "submit". I think the one you're looking for is the 226292.