I've used the Mitsubishi original wshields on my last three vehicles and they all had the same method of installation. None have ever been a problem. The change in the new model may be the issue though there must still be some fixing points under the bonnet/hood for the brackets to attach to and then you screw the other screws in from the top. The new one linked by @Phever looks quite unsightly IMO. The old sleek and clean look I have was much better. It was from Mitsubishi North America and not sourced locally.