The Exo Terra Glass Terrariums come in set sizes, and you can now purchase your required size in mesh top to replace your current one. These are all 45cm depth from front to back, and come in a choice of widths - 45cm, 60cm or 90cm. The height of your enclosure is not relevant for these.
These are easy to install, and will make a big difference to a tired and worn looking terrarium. Please ensure you measure your terrarium to ensure the size is correct, and then pick the one you need!