I'll stop in at the store and get the parts numbers. Spacing is about 7-1/2" center-to-center. The outside edge of the outer teeth are just about flush with the edge of the bucket. To mount the bar, I used some angle iron that I trimmed to suit.
Attached is a sketch of the bars I welded into a "V" and welded the teeth to. At each end the short piece of angle was welded onto the same surface as the teeth. I trimmed the lower part of the angle off where it protrudes into the bucket, and cut the leading edge of the angle iron at an angle. It's harder to explain than it was to do.
The end teeth are actually on top of the angle iron. This makes them 1/4" higher than the rest. This doesn't cause any problems when using it. It would be a simple matter to cut an extra 1/4" off the bottom of the weld-on teeth if you want to.
A 3/8" bolt on each end has worked out fine, especially since the "V" sandwiches over the bucket cutting edge. I have hooked into things that don't move with one tooth, and picked the one back wheel off the ground even with the weight of loaded tires and a RFM attached....................chim