Other manufacturers can do all sorts of things to try to be compliant, but ultimately the only way to be in compliance is to bend the knee.

They’re welcome to sue, but that could take years and millions to figure out.

I was involved in similar efforts to remove Chinese parts from the supply chain during the previous Trump administration. It was a nightmare that involved dozens of people reviewing tens of thousands of parts across hundreds of components with multiple revisions. I was involved for two years and that wasn't even the entire thing. Most changes required multiple layers of analysis/engineering review, change proposals (which often had to pass change review boards), vendor negotiations, manufacturer negotiations, reams of documentation about changes to refit procedures for previously produced HW, testing, validation, etc.

Removing Mexico and Canada from supply chains would be even worse. Probably nigh-impossible for some OEMs.

The fuziness mentioned comes from when outside firms try and estimate the % domestic content. Unlike CBP they’re largely making estimated guesses, but luckily that’s not how the tariffs are calculated.

Most manufacturers will eat the cost and raise prices to a certain extent. Base models of any product tend to be manufactured in such as way that they have much looser margins.