[Elecraft] FT100 knob rubber ring

[akern@haverford.edu]

Hi all--

I'm going to order the FT-100 knob in the next several days.  I talked
with Yausu customer support and they have it in stock, but they also
mentioned that they have a rubber ring (P/N RA0068200) that goes with it. 
Do I need this ring as well for the K2, or is the ring something that is
required only for the FT-100?

Is there anything else that I should order from them to go with the knob
while I'm at it?

Thanks!

P.S. K2 # 3547 going FB on the RF board

-Adam, N1KO