CVmom,
There is no "refrigerator" cabinet. You can order the pieces to fit around the refrigerator to make it look built-in. There is also no panel in the US Ikeas for the front of your refrigerator.

I think some people have managed to create their own, but I am not sure how they did that.
To make cabinets to make your refrigerator look built in, start with a over the refrigerator cabinet 36" wide and tall enough to go the same height as the cabinets on either side. If possible, having 24" deep tall pantry cabinets on either side of the refrigerator adds to the effect. Since your refrigerator is not cabinet depth, you may want to recess the back of it or pull the cabinets around it out to give the illusion that it is.
Check in the
Galleries here for ideas and in the
Assembly-Installation and
Modifications sections for the practical part of how to.