I don’t give up easy. Who do you believe? Here is a Cub service memo saying round heads with the 3 on them, and here’s the package the dealers have that says hex heads. It also says the hex heads are grade 8!!! Don’t care anymore but sure don’t wand to put grade 8 in there. I actually talked to a guy at Cub R&D and he said use the round ones that have the 3 on them. He claims they really are grade 3. I hope you can expand these, if you care you can save them then expand.