It was rare that we could reuse plow share or land slide bolts. The heads are almost always wore off. 99% of the time we welded the head in place so you could get the nut off. Long way of saying are those bolts even worth trying to save?
Doubt any of them are. Just trying to get the new ones on. Have some from bolts agri supply. My open end wrench didn’t quite fit. Guess I’ll have to go search for a thinner wrench.