I may be myopic but I can't see K3 front panel knobs listed on the Miscellaneous Parts page of the Elecraft website. I don't have any problem with the knobs on my K3 but I'd like a couple for something I'm building that I want to match the K3 (I assume they fit a standard potentiometer shaft - I haven't tested it.) I may as well get a couple of spares at the same time.