The shower door spring mechanism for the 2021 Forest River Surveyor does include all necessary components, including the clear plastic piece that attaches to the endcap. Replacing this part should restore your shower door functionality without the need to replace the entire door assembly. If you prefer, complete shower doors are also available for purchase. For reinstalling the rail, double-sided tape is recommended; although we do not carry it, a 3M foam tape from hardware stores is a suitable option. If you need assistance ordering the spring mechanism or have further questions, feel free to reach out for support.