I want to find these specific knobs

hi there.  I have a Croft Acoustics integrated, and I'm trying to find some specific knobs to replace mine, and the particular knobs I'd like are featured right on the home page of Croft's website.  it looks like he used to use these chrome knobs with a 'dot' indicator on his amps before he switched to these brushed aluminum knobs. 

it's almost embarrassing to say, but I'm having trouble finding anything that looks like those.  any tips?  I wrote Croft about it but never heard back. 

Thanks a lot.