Wooden bowling balls (Whitley)

I know this is a long shot but I am looking for 6 wooden bowling balls from which to make some dead eyes (see picture) which are needed for the rigging of a historic Victorian sailing vessel that is currently being rebuilt by a friend. The balls need to be made of lignum vitae and be over 5” in diameter. If you gave some of these lurking in your attic, I’d be very grateful to have them.