[Elecraft] K3 boards

[todd ruby]

I have a self assembled K3 and at the time I did not want to get the board that had the second SO-239 antenna port but now I do. I do not see it as being available on the Elecraft site. As a matter of fact there is little in the way of further K3 hardware support.
 
Also I wanted to install the KIO3B board with USB and the board that has the 12,10 and 6 meter preamplifiers on it, which is standard on the K3S. Are these boards not possible to be installed on a K3?

Thanks to all

todd
WB2ZAB