I would change both, if ones gone the other wont be far behind, follow rave as the spacer at the top is supposed to be a certain way round but I couldn't see any difference and definitely Delphi.
Allmakes sometimes offer their PR2 grade which is quite often OEM like Delphi or Moog but standard all makes could be similar to britpart in origin
And don't be surprised if you still have knocking once you have changed them as could be all manner of things