Agree with a hardware store grade eight purchase. Probably cost less than the shipping on anything you order. If the heads are too thick and hit the block....... you do have a bench grinder don't you?
Yes that one crossed my mind as well.. I was thinking go to the hardware store and buy some grade eight bolts and just grind the heads a little bit.. but again for under 10 bucks I can just pick up a set at the parts store here when they open..