Shower wall attachment device

[RDP]

Per the attached photo, the upper shower wall has warped slightly at top rear of the trailer and I need to drill and attach 2 more of the shower wall attachment devices shown in the picture. What is the name of the attachment plug devices and where can I find them? I would like to find matching item rather than a regular screw.

[neub]

This may similar to what you are looking for but these are white not off white. https://www.amazon.com/AP-Products-0...02562288&psc=1