If you need to fill in these pieces, no worries, it’s not too tricky at all. For stained sets, get materials made from the same type of wood as the rest of your cabinets. Then, take a sample of your stain to a paint store and match it, so everything is the same color. Follow this process for painted cabinets as well. Simply buy the materials you need and take a sample of your cabinet’s paint to be matched.