A window regulator assembly in a vehicle includes a glass lift plate assembly for moving a window glass up and down along the guide rail. The glass lift plate assembly includes a slider base, a glass holder configured to receive and hold the window glass, and an attachment bracket placed on the glass holder to securely hold the window glass. The glass holder includes an inboard part and an outboard part, and is connected to the slider base by an adjustment member, which is configured to adjust a top edge of the window glass. Further, the window glass is placed between the inboard part and the outboard part of the glass holder and also fixedly held by an attachment fastener. The inboard part of the glass holder slidably moves relative to the outboard part of the glass holder by the rotational movement of the adjustment member.