 "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." 
 "GoPro Headstrap Mount + Quick Clip (GoPro Official Mount)" "Professional Video Accessories | All Tech Toys"
"Includes a Head Strap and a Quick Clip for a variety of head- mounting options. Fully adjustable to fit all sizes, the Head Strap can be worn over a helmet or directly on your head to capture footage from a headlamp-like perspective. The Quick Clip enables ultra-compact, low-profile mounting, and can be used to attach your GoPro to a backwards baseball cap or other 3mm to 10mm thick object." 