Product review (5 stars): There are at least two different configuration for this part ...
There are at least two different configuration for this part number,  The difference is in the size of the threads that screw the item onto the motor.  The number 29 stamped on this configuration will replace the part that also has a 29 stamped on it.  If the part you're replacing doesn't have a 29 stamped on it, then this is not the item you want, You want the same part number without the 29 on it which is also the same part number.