Home Avionics 40688G-84 KIT,SCREW WASHER & GROM. 10 PK 40688G-84 KIT,SCREW WASHER & GROM. 10 PK 40688G84 SKU: 40688G-84 Categories: Avionics, Avionics & Instruments, David Clark, Headset Accesories, Pilot Supplies Tags: (10/PK), KIT, screw, WASHER & GROM.