W10842586 30" Black Filler/Spacer Kit for Cutout Heights between 19" and 19. The Built-In Microwave Spacer Kit includes a 30 L trim piece. all necessary mounting hardware and installation instructions. This black accessory creates a finished. custom look for your built-in microwave by filling in extra space that may exist aro... - W10842586 30" Black Filler/Spacer Kit for Cutout Heights between 19" and 19.