If you're going to build them yourself, note that the link I provided above is talking about the flat-flex connectors specifically for the cards using 2x40 = 80 contacts. Hence the 080 in the part number. You'll want the 100 contact version which does not show up in the datasheet as a contact option, but does show up as an obsolete part if you search for it.
For the flat-flex side plug (not the board side socket), the part number is probably P08-100-PLxx-A-G where xx is the vacuum pickup and packaging options, but you should double check me before ordering if you find a source. You may have a hard time finding it.
You might want to try posting a query on logicanalyzers or HP-Agilent-Keysight-equipment over on groups.io. Someone might have some extra 2x50 flat-flex jumpers.
Good luck!