Product review (2 stars): Looks can be deceiving Plugs or Caps
So, these plugs are a bit hard to find especially if you are looking for quality.  There were two problems with the original. 1) the o-ring had expanded and was loose on the plug. 2) the locking tabs on the bottom were wore down and no longer held the plug in place.
Pros: The locking tabs are the same and are holding the plug in place.  The price was right initially.
Cons: The plug is about 2/3rds the density of the original.  The o-ring expanded a lot faster as in a few weeks compared to 10 years on the original.

Bottom Line: Find one that is OEM and costs a bit more but my guess is that it will be an after market copy and will not hold up either.