I've done that but they're on the other side of the world so mailing me a new correct set will take weeks if not longer. Looks like I have a local supplier that carries locks but mainly Chev stuff which is too small or BB Chev/Chrysler but they look to be for a square slot. They have a BB Ford spring clip that's slightly larger @ 1.180 vs the Chrysler size @ 1.120.
SPLR179 - FORD BIG BLOCK PISTON PIN
That's looking like my only option.