I used the 8103c teeth and the D58499 adapters, you need to make sure the width of the slot on the adapters fits over the front of the bucket plus the thickness of the steel you used to weld them to. I don't have any rocks around here, just dirt and clay, it digs very fast, I lower the bucket to level and the teeth stick below the bucket 1 1/4". I just drive forward and within 12' to 15' the bucket is full. I'm not sure of the spacing between teeth, I just evened all 8 teeth out the same distance apart, it would depend on the bucket width and number of teeth you get.