After the whole stack was unloaded, my dad had the brilliant idea of measuring the span with his tape measure. That brought the bad news that they were all too small by an inch or so. If they had been too wide, we might be able to compensate, but since we don't have a barn-shrinking tool, we are stuck! After conversations with the crew and phone calls to the company, they decided to make a new set (at their expense, since it was their mistake). They also decided to leave the originals laying in the field, since it was not worth their time to tear them apart for scrap. So now I have a full set of arched trusses for the next barn project. Good news!