Purchase price is for (1) One 

SCOTT AV2000 Audio Accessory Mounting Brackets 

Voice Amp Bracket
Part number: 804636-01
"Multiple AV2000 Mounting Brackets Available"

Scott Audio Accessory Mounting Bracket - Used with Facepiece Mounted Communication:
Voice amplifier P/N 804564-01
Scott Talk Around II Facepiece Radio P/N 804827-01