Do I need any fasteners or studs to install this?

Fasteners are not included with this gasket. You'll use your vehicle's existing header bolts and studs — just pull the old gasket and lay the new one in place before bolting back down.

Should I clean or prep the mounting surfaces before installation?

Yes. Scrape away the old gasket material from both the header and cylinder head surfaces until they're clean and flat. Any debris or old gasket bits left behind will cause leaks.

What's the return process if this doesn't fit?

Once installed, gaskets cannot be returned due to contamination. Test-fit before permanent installation to confirm alignment with your header bolt holes.