A track fitting assembly adapted to be mounted to a track comprising a pair of lips comprising at least one opening, said track fitting assembly comprising: (a) a main body comprising: (i) at least one plunger aperture comprising a plunger-spring biasing ledge; (ii) at least one button aperture intersecting the at least one plunger aperture; and (iii) at least one disengagement recess (118, 150) positioned adjacent an edge of the at least one button aperture; (b) at least one shear plunger assembly coupled to the main body and comprising: (i) a plunger comprising a slot, wherein the plunger is positioned at least partially within the at least one plunger aperture so that the slot is aligned with the at least one button aperture; (ii) a shear pin coupled to a lower end of the plunger; (iii) a plunger-spring biased between the shear pin and the plunger-spring biasing ledge; and (iv) a button positioned at least partially within the at least one button aperture and the slot; and (c) the at least one shear plunger assembly is configured to have a disengaged position and an engaged position, wherein: (i) the disengaged position comprises the button extended from the main body and the shear pin positioned within the main body; and (ii) the engaged position comprises the button positioned substantially flush with the main body, and the shear pin extended from the main body and within the at least one opening characterised in that (d) the button comprises a recess such that in the engaged position of the at least one shear plunger assembly, the recess of the button is positioned substantially flush with the at least one disengagement recess of the main body. (a) a main body comprising: (i) at least one plunger aperture comprising a plunger-spring biasing ledge; (ii) at least one button aperture intersecting the at least one plunger aperture; and (iii) at least one disengagement recess (118, 150) positioned adjacent an edge of the at least one button aperture; (i) at least one plunger aperture comprising a plunger-spring biasing ledge; (ii) at least one button aperture intersecting the at least one plunger aperture; and (iii) at least one disengagement recess (118, 150) positioned adjacent an edge of the at least one button aperture; (b) at least one shear plunger assembly coupled to the main body and comprising: (i) a plunger comprising a slot, wherein the plunger is positioned at least partially within the at least one plunger aperture so that the slot is aligned with the at least one button aperture; (ii) a shear pin coupled to a lower end of the plunger; (iii) a plunger-spring biased between the shear pin and the plunger-spring biasing ledge; and (iv) a button positioned at least partially within the at least one button aperture and the slot; and (i) a plunger comprising a slot, wherein the plunger is positioned at least partially within the at least one plunger aperture so that the slot is aligned with the at least one button aperture; (ii) a shear pin coupled to a lower end of the plunger; (iii) a plunger-spring biased between the shear pin and the plunger-spring biasing ledge; and (iv) a button positioned at least partially within the at least one button aperture and the slot; (c) the at least one shear plunger assembly is configured to have a disengaged position and an engaged position, wherein: (i) the disengaged position comprises the button extended from the main body and the shear pin positioned within the main body; and (ii) the engaged position comprises the button positioned substantially flush with the main body, and the shear pin extended from the main body and within the at least one opening characterised in that (i) the disengaged position comprises the button extended from the main body and the shear pin positioned within the main body; and (ii) the engaged position comprises the button positioned substantially flush with the main body, and the shear pin extended from the main body and within the at least one opening (d) the button comprises a recess such that in the engaged position of the at least one shear plunger assembly, the recess of the button is positioned substantially flush with the at least one disengagement recess of the main body.