Factory 4-point chassis brace is a factory part on the 2021+ Elantra N, and this brace can be installed in other Elantra models and K3/Forte models with basic tools.
You can use a pop rivet gun for the installation, after drilling a few holes, but you can use just normal nuts and bolts for the install just as easily.
Instructions are not included, but they are easy to find on the internet. Here is a link to a Forte forum post where they installed a brace on a Forte.
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