[lo bux racer]

There aren't. You'll need to cut the mounting tabs off the OEM header and weld them onto the new header if you want to mount the heatshield.

Not that I would do something like this, but it certainly has occurred to me that someone could make a dollar or two doing this to help stealth an unapproved aftermarket header in a smog nazi infested state. It would rather suck to get caught though.