There was a discussion about this issue, under another heading, but I can't find it today, so I thought I'd start the topic under its own heading.

I just got the SPEC Stage 2 clutch for my car, and I noticed there are no shims. As discussed earlier, it would seem necessary to put in shims equivalent to what was machined off the flywheel?

What should I do here?

 

Your local machine shop should have them. I wouldn't expect it to be included with the clutch as the factory doesn't list a tolerance on flywheels. They simply expect you to buy a new one.