M8 bolts in many lengths, I use RealOEM to get the proper lengths. The water pump and timing cover use many sizes, plus I use the 12mm head M8 nuts for the intake manifolds, copper exhaust nuts, M12/14/16 locking nuts for suspension, speed clips in various sizes, cotter pins as well. I also stock M6 bolts in a few sizes. Can't have enough wave washers too!