Thanks for that link. But too late, I've gone ahead and attacked the bridge with a round file and ground out the medial sides of the holes.
It now fits, looks a bit ugly (irregular), but as they say, a man on horseback wouldn't notice.
I've strung it up and the strings run centrally, so problem solved.
Those GFS bridges seem to be the only ones of 72mm, so could be handy for future similar situations.