Thank you for contacting Aston Global, Inc. We greatly appreciate that you are considering an Aston product for your project. This model fits a width between 39 1/4" and 40 1/4", from tile to tile. The model you need is the SDR985-CH-41-10, this fits a width between 40 1/4" and 41 1/4".

Thank you so much. Now what kind of pan for this door?

Aston recommends a finished bathroom-friendly surface, such as slip-proof tile or natural stone as a base for the NAUTIS Completely Frameless Shower Door Collection. We do not recommend third party band bases with our doors.