Need serial cabe for pdp 11/34 M7856

[Devin]

The cable that came with my 11/34 is for current loop, i need a cable 
that is wired for serial. If no one has the cable, i could make one 
myself, i just need the 40 pin connector that goes on the cable. I have 
been unable to find the connector. Oddly ebay appears to have the side 
of the connector that goes on the M7856 board itself, but i need the 
other end, that goes on the wire.

Any help is much appreciated. Lots of setbacks with this thing. I just 
want to see it running already.

--Devin