Noble Hero chair - lever handle

[be-green]

Hi, I've got a Noble Hero chair which I've had for nearly a year now. I've appear to have lost the 2 x plastic lever handles which cover the metal rods which allow you to adjust the chair height and tilt. Do Overclockers sell the plastic handle or can get hold of this? I can't see it the website or on Noble Chairs website either.

Chair - https://www.overclockers.co.uk/noblechairs-hero-gaming-chair-black-white-gc-00x-nc.html

Thanks