I have a 60" Exmark Lazer Z and one of my front caster bearings fell apart tonite. I live 120 miles from my dealer so getting one tomorrow is out of the question. I assume they are standard tapered roller bearings. Hopefully I can get one at a supply store tomorrow since I have a mowing job in the morning. Anyone have any experience replacing these bearings from other than the dealer? Also, I wonder why it fell apart. I just checked them about 50 hours ago. I left a little drag on them. Maybe not enough?