From Amazon
Manfrotto 509 Fluid Video Head with Aluminium 645 Fast Twin Video Tripod, Professional Kit with Tripod Head and Camera Stand, for DSLR, Digital Camera, Camcorder, Videographer, Payload 13kg
WEX Photo Video
Manfrotto 509 Pro Video Head + 645 Twin Fast Aluminium Tripod
DigiBroadcast
Manfrotto MAN-MVK509TWINFA 509 Pro Video Head with 645 Fast Twin Aluminium Tripod