It is still a clip. Trust me.
You can get a small C clip, that sits down on the recess on the slide. Or you can get the LARGE clip like it sounds like you have, that sits up on top of the recess in the slide.
There is about 1/2 a step difference between the large and small clip, since one sits down in the hole in the slide, and the other sits on top. So if you want 1/2 a clip change, get the other clip. If that makes sense.
I played with different clip settings and different needles, and different jets, for years on my 1994. The factory settings where pretty darn accurate despite all of the people whining about EPA settings.