9" Flat Side Extension Plates are used to extend the mounting hole locations. It is recommended for use with the Offset Mounting Brackets.
The kit consists of 2 brackets. The brackets are available in Obsidian Black (J0018-OB) and Pearl White (J0018-PW), to match your STD2 air curtain. And available in Titanium Silver (J0018-TS) for your HV2 air curtain.