Went out and looked at it this morning. Decided if I can't find some that I will cut the old ones off leaving enough material to use as a mounting flange. Drill some holes and bolt the new ones onto the side of the flange. The original tines are very wide and should make a good mounting bracket. Don't know why I didn't think of this earlier. Might even get fancy and put them in the lathe and round them off.
The Roper tiller I bought last summer has similar tines in similar condition. Please let us know what you come up with as a replacement.