[Hallicrafters] Need a Couplet. Can you help?

[Van K7VS]

Hi Folks.  Looking for a couplet to finish up a project (rebuilding an old
am/cw transmitter.  The one I need to finish the project is the PC81.  I
found the schematic for these and if push comes to shove can produce a
perfboard version but would dearly like to find on.  Thanks for any help you
might provide.  Of course, I will buy yours if you have one available.
Thanks much.  Van, K7VS