Product review (5 stars): LG DLE5977W - Thump no more!  or so I thought... - UPDATED - it is back!  Wrong part.
I ordered four of these from North America HVAC to replace the rollers in my LG DLE5977W dryer.  One of my existing rollers had a large flat spot.  I also ordered a replacement belt from North America HVAC.  It was a whole $.01 more than the lowest price on Amazon.  It was good to get all of the parts I needed at once.  The rollers I received are red rather than blue, and include the center shaft.  Other suppliers also show the red rollers.  If you are going to go make the effort to disassemble the dryer, you may as well replace all of the rollers and the belt.  My order was shipped quickly.  The parts arrived this morning and the dryer was running quietly a few hours later.

Update - Initially worked well.  We noticed the thumping is back, not as bad as before I replaced the rollers and belt, but it is back.  When we start the dryer it makes a thumping noise for a while but it eventually goes away.  With each use the thumping gets louder.  I am very disappointed and am not looking forward to tearing the dryer apart again.  I contacted North America HVAC they issued an RMA number.  Once they received the rollers they processed a refund.

I contacted LG to determine the correct part for my model.  LG has updated their parts list for the DLE5977W.  It is now the 4581EL2002C which has white hubs.  Repair Clinic Dot Com had the 4581EL2002C's in stock and was able to overnight them to me.  They also have a video showing how to replace the rollers, not that I needed it...

North America HVAC was responsive to my problem and issued the RMA and refund promptly.  I will consider ordering from them again based on their customer service.

The Amazon parts checker and photos need to be updated.