You should leave the connectors on and simply buy a longer ribbon cable with the appropriately silvered ends, with the right number of conductors. Those FPC connectors lock, they can be opened and closed a limited number of times, you just press on them and flip the cover piece up to open, flip it back down to apply pressure and close. I have one on my GPSDO. That one looks like it may be a 50 conductor but to avoid mistakes, I'd count them before ordering,