Abstract: An improved liftplate attachment arrangement used to support an automotive door window. The liftplate is formed with a recessed attachment area adjacent a bracket which supports a lower edge of the window. The window, having a circular hole, is fixedly attached at the recessed area by means of a retainer assembly comprising a plastic disc-cap encasing a T-nut. The T-nut has a central internally threaded tubular portion concentrically surrounded by a plurality of disc-cap spring fingers, the inboard ends of which are formed with radially extending crossheads the outer ends of which are adapted for snap-in reception in the window hole. A screw shank, after being passed though a slot in the liftplate recess, is threaded in the T-nut tubular portion, while the shank blocks juxtaposed inner ends of the crosshead from being flexed inward for release of the fingers thereby locking the retainer assembly against removal.