Section 255(3) in The West Bengal Motor Vehicles Rules, 1989
(3)Each such chock shall have a hook and be kept, -(a)in a bracket fitted on the outer skirt of the tail-board of the vehicle; or(b)where the vehicle has no tail-board, in a metal carrier fitted between the frame side members, underneath the body nearest to the rear wheel on either side. The tail-board of the vehicle and where the vehicle has no tail-board, the wooden planks above the frame side members shall also have a hook in the centre.
