Those are just stock replacements.
The good ones are like $250.
According to John Cope, very high compression motors can break the ears off the stocks gears upon firing the motor. He claims there is a very violent back and forth on the gears from the high compression that sometimes break the pump gears. Ymmv.
The good ones are not the same. The drive lugs are much bigger
and there is only a chamfer on one side instead of both sides which is supposed to not break your converter hub because there is more surface area. See the pics for the difference. One pic of each side of the gear, stock is on the left.
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View attachment 1715524792
