These are custom catalogue objects of the Harbinger and Tall Order cabinets that do not drop with walls, so it won’t look like they’re missing when viewed from the back side.
There are No-Drop Cabinets for other kitchens as well. I strongly recommend to use this in conjunction with this mod — shader fix for the Harbinger cabinets, so that they will be rendered like the counters.
They work like the regular cabinets apart from the non-dropping thing (in fact they are the same objects), model/colour selection and all. Available in counters (not cabinets!) for the same price as the original ones.