Just a follow up...
I ordered the correct tie-down parts from Messicks (it was only $17, so it wasn't worth my time to fab something up, as I don't have extra metal around to do it, and a trip to Home Cheepo would have cost just as much).
I'm picking up the parts today, and will be back in business to mow; well if the rain will stop long enough for the grass to get dry enough to cut without making a mess of it.
Thanks to all for you help!
Jay