Product review (4 stars): Whisper Quiet - Just Make Sure To Use the Triangle Clips!!!
The rollers in my dryer were replaced earlier this year by a repairman who apparently didn't change the triangle clips when doing so.  A few months later the dryer started thumping like it was trying to tear itself apart.  Once I got it apart I found the new-ish rollers -- one now destroyed -- along with a really old and broken plastic triangle clip.  I ordered these and installed them myself (should have done that in the first place) and replaced both sets of clips in the process.  Perfect fit, and the dryer is now so quiet you can barely tell that it's running. Great replacement parts.