Size one to fit yours
Measure the inside of the drawer, not the outside. Thickness is your actual plywood, measured with calipers - "3mm" ply is usually 2.7-3.2mm, and that difference is the whole game.
Measure the inside of the drawer, not the outside. Thickness is your actual plywood, measured with calipers - "3mm" ply is usually 2.7-3.2mm, and that difference is the whole game.