I have left a message about this on the Flirc site, and will post their response in due course. I am not really inclined to buy a cable 'on spec' without more reason to think it really is different. seem to stick out as much as) those on the cables I have, and the specs do not include connector width. The connectors on all the ones which have images look like (i.e. I now see the FAQ entry, but the link points to a page with a table with multiple cables listed.
I haven't tried it myself, if you do please let us know if it fits.
There's a FAQ on the Flirc RPi 4 case page where question 9 specifically adresses the gpio ribbon cable issue: I haven't seen anything like this available. For a connector to work with the Flirc case, I think that it would need to be moulded on to the wire, with little or no overlap at the ends. Almost any 'filing down' will damage or destroy these clips, and the connector will then come apart and lose contact with the cable wires with minimal disturbance. The connectors I used then, and the ones that seem to have been used on the commercial ribbon cables I have now, come in two parts which are clamped together over the cable and held together by clips on both ends of the connector. I used to make my own ribbon hookups for IDE drives, since this allowed me to use the exact length of cable that fitted best for a given case/motherboard/drive location combination - improving both access and cooling. You'll probably need to file it down to 52mm in order to have the cable fit to narrowest top part of the pillars, but this is not recommended as it will surely weaken the connector. Well checking again the ribbon pin1-to-pin40 distance is about 51mm (again you may correct me on this) It may be a "stupid idea" but have you tried filing the sides of the ribbon connectors to reduce the overall length? In my measurement, the 40-pin ribbon connector's length is about 55.5mm (correct me on this), while the pillar to pillar widest distance is 53mm so definitely a 40-pin ribbon connector's 55.5mm will not fit. I confirm this on the RPi3B+ version of the FLIRC case (just took mine from storage to verify pfletch101's concern)
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