Product review (5 stars): The last one was not broken and looked fine but would not ignite the oven
My gas range is used everyday as well as the oven.  When I went to fix breakfast and had biscuits ready to go in the oven but it wouldn't light I immediately went to get an igniter ordered.
When I started the oven it  went through the same sequence as always, you could hear the igniter clicking but would not light. This is the second igniter that I have replaced.  The first one I replaced would not ohm out.  In other words it was broken inside the ceramic.  The last one was not broken and looked fine but would not ignite the oven.  The day the igniter got to my house I started to change the igniters out.
It actually takes longer to get the racks and bottom out than it does to take the igniter out.  Mine has two 1/4" hex head screws that hold it into place.  One of the screws is a little difficult to get to but not that bad.  Pull it out with the wire attached.  Plug the wire into the new one.  Put the screws back in and reassemble the oven parts.  Put the racks back in and you are ready to bake.  I must admit the first time I changed it took a little longer than this time.
The igniter fit perfectly and worked first time after installation.  Since installing I have had no problem what so ever with the oven igniting.
My range is approximately 10 year old, two igniters later and I still love it.  I hope you find this review helpful.