The glass panel is factory cut by machine, so will always be the same size and so should fit.

The glass is however a tight fit and this is the way it is designed, so that it creates a good water tight seal.

To fit the glass side panels, simply loosen the screws at the top and the bottom of the vertical (silver/grey) framework that hold it to the curved front rails, and this will give you the freedom to fit the glass into the vertical upright, then once you have done this, tighten up the screws.

Remember to ensure you for the clear seals supplied with the shower along the edges of the glass before seating into the frame.