 "Manfrotto 500 Pro Fluid Head Flat Base"@en Base MVH500AH - Filmtools"@en
"
Pro Fluid Head Flat Base
Lightweight head
Smooth shots and fine contro
Supports equipment of up to 11 lbs
Easy Link 3/8" connector 
"@en 
 "Manfrotto 502HD Long Quick Release Plate 504PLONG" " Manfrotto 504PLONG For sale! - EuroOptic.com
"This Manfrotto Long Quick Release video camera plate fits 502HD, is made from black aluminum, and has a length of 50cm." 