Hitachi makes the cable:
https://www.hca.hitachi-cable.com/products/hca/products/ribbon/wide-pitch/0.100-pvc-stranded-wide-pitch-ribbon-cable.php
I have yet to find anybody that makes the IDC plugs for 0.1" pitch without buying them a thousand at a time. Widest I have found available is about 20 pins wide so you will probably need to use connectors end to end - so make sure they are sized for end to end clearance.
I have 350mm (just under 14") versions of these cables. The manufacturer for my cables will make these any length you want but you need to buy 500 at a time.