REVERSIBLE SPRING ASSISTED CAM LIFT HINGE,

10-1/8" LONG OD. X 5-21/32" WIDE.
TO REVERSE REMOVE CAP AND PUSH OUT CAM, REPLACE CAM ON OTHER SIDE OF STRAP AND REPLACE CAP. STRAP HAS A HEX HOLE IN IT WHICH ACCEPTS THE STEM FROM THE FLANGE., 

NRE # 090629