Harmonic Balance O-Ring

[Cjhols]

Hi all,
I have a Rover 3.5 where I have removed the harmonic balance to replace the front pulley - Unfortunately, I can't remember if the O-Ring (see picture) is part of the harmonic balance??? It is NOT on the Rimmer Bros. web-site https://rimmerbros.com/Item--i-GRID800015 but I just wanted to make sure???
Also, as I have remover the power steering and air-con is it ok to remove the associated pullies or would you just leave them.
Thanks
Peter

[ChrisJC]

The pulleys are part of the balanced assembly, so you would change the engine balance slightly by removing them.

Not sure about the o-ring - I've never known anybody dismantle the harmonic damper!

Chris.