Fusion Signature Series Flush Mount Kits - 7.7" SpeakersSignature Series Flush Mount Kits 7. 7" Speakers Designed with sleek and minimalistic design aesthetics, the Fusion Signature Series flush mount kits allow you to install Signature Series 3i classic style speakers with a premium near flat finish mounting profile no thicker than 2 mm [0. 08]. The flush mount kit features a non intrusive mounting system for easy installation. Simply place the kit into the cutout, then place the speaker (sold separately)