I just ripped off those "TOD" heat shields last weekend. The clamps had rusted through (50k miles).

There were remnants of some sort of fiber 'packing' between the pipe and shields. I assume this is also for heat shielding and sound deadening. If this fiber is gone, I don't think that simply replacing clamps is going to fix the rattle for long.

If you do remove the shields and you are worried about the excessive heat near the TOD unit, you can purchase an aftermarket heatshielding wrap (blanket or tape type) to replace the failed factory exhaust shielding.