Product review (5 stars): Be Sure You Get the Original Manufacturer's Replacement Parts Like This One
Made my dryer work like new, be aware that there are different suppliers of these kits, you want to get the FSP or Whirlpool-sourced kit.  They all use the same part number, so you have to read the descriptions carefully, you don't want the "FSP equivalent" or "replaces FSP", etc.  The "equivalent" or "replacement" kits are cheaper, but you get what you pay for.

I had installed one of the "equivalent" kits previously, and the rollers made a loud thumping noise until the dryer warmed up.  Also, the "equivalent" kit's drive belt stretched so that the dryer also made a squealing noise on startup.  After this Whirlpool-sourced kit was installed, all of the thumping & squealing noises went away, so that the dryer now sounds like it did when new.