End panels compete your rectangular bath installation where an end surface needs to be closed. If acrylic, they are usually of a dedicated nature designed to fit a particular bath. If wooden, some can be adjusted to work in other situations as well. Be sure to understand the bath in question as some shower or corner baths may have other variations on the bath panel available such as ‘L’ combo panels etc. This prevents making a mistake and selecting something that is not suitable for your needs.