Hey guys Im currently running an 05 Marzocchii MX PRO with ETA fork on my specialized HR. Ive got the plastic ETA knob on it and was wondering if it was interchangeable with the new 07 ETA aluminum knob which seems more sturdier and looks a little bit better

Can this knob be bought separately? what tools are needed to swap this out because I dont think i remember seeing a screw anywhere on that knob??thanks you oguys