Mine are rusted to hell and thinking about replacing.. but when I go to Toyota's site they have a couple different part numbers:
Here's a "Backing Plate" they want 272$ for:
| McGeorge Toyota Parts
Here's a "Dust/Splash shield" they want 66$ for:
2003-2009 Toyota 4Runner Splash Shield 47782-60120 | McGeorge Toyota Parts
Here's a link to all the components:
Brake Components for 2006 Toyota 4Runner | McGeorge Toyota Parts
What the hell is the difference?