This latch support replaces the original supports that broke on my truck bed storage boxes.

Like these:

https://www.amazon.com/Truck-Bed-Toolboxes/b/ref=dp_bc_aui_C_4?ie=UTF8&node=15737921

No supports needed.

I used PLA, but if you have a really hot evironment, you could use PLA+, PETG or ABS. So, choose your flavor.