Hello Jill P,
Thank you for your question regarding the Delta UPstile™ 48'' x 74" x 34'' Shower Wall Set and I am happy to assist you today.
The total width of the back wall panel, including the nailing flange is 47 7/8" or 121.60 cm whereas the total width of the side wall panels including the nailing flange is 33 3/4" or 85.73 cm. The nailing flange lines the tops of the back and side walls as well as the side of the left and right panels.
To view further dimensions, please visit the link below to see the Technical Specifications Sheet for this model:
To view an installation video for this surround to get a better idea of where the nailing flanges are located on this model, please visit the link below and select the video from the photo gallery:
Unfortunately, we cannot guarantee that a shower base produced by a different manufacturer will positively fit with our wall surround, although you may consult the Technical Specifications sheet and Maintenance and Installation Manual for our shower base, model 40074, by visiting the link below to compare with the base you are interested in using to ensure the dimensions and stud layouts are similar:
If we can assist you with anything else going forward, please do not hesitate to give us a call at 800-355-2721.
Delta Faucet Company
Date published: 2018-04-02