 "Manfrotto Video Camera Plate - 504PLONG" " Manfrotto 504PLONG | WTS Broadcast
"This long version of the standard plate allows perfect balance for camcorders with unusual weight distribution caused by long telescopic lenses or heavy batteries. Supplied with 2x1/4&rdquo; and 2x3/8&rdquo; camera fixing screws. Dimensions: 140x10.7x50mm (5.5x0.4x2in)." 
 "Manfrotto 502HD Pro Video Head w/ Flat Base MVH502AH" " Manfrotto MVH502AH For sale! - EuroOptic.com
"This Manfrotto 502HD Pro Video Head with Flat Base has a 3/8-16" Connection and is designed for use with HDSLR cameras." 