I bought my '00 3rd Gen T4R with 18" 2012 Tacoma TRD Sport chrome "clad" wheels and got a nice gash in one of the wheel covers after off-roading on Sunday. I tried to do a search and couldn't quite yield the part number from Toyota for these wheels. At first it looked like I possibly bent the wheel, but it's just the "cheap" chrome cover that got beat up.
Here's a pic of what the wheels look like: