The part in question is called an igniter and can be purchased at your local appliance parts retailer.
It's not that difficult to replace the igniter. I can't give you an exact part number, but it'll be either the round style
or the flat style
. (You really don't need to know the part number, just ask your appliance parts guy for either flat or round igniter. They are both universal as far as brands are concerned. But if you're the curious type here are the numbers; Round= 4342528 and Flat= WB2X9998. Don't use the part numbers I linked to, above. The numbers there are specific to Repair Clinic, and NOT actual OEM part numbers)
Now for the fun stuff... the actual repair!
PULL THE OVEN OUT SLIGHTLY, REACH BEHIND IT AND UNPLUG IT!!!
1.) 1/4" socket or nut driver
2.) Flat or Phillips screwdriver
4.) Wire cutters
5.) Wire strippers
Remove the racks and then remove the "floor" panel of the oven. Then remove the diverter panel (might be a 3/8" nut or a wing nut... use the pliers here). Basically, you disassemble the entire bottom of the oven. You may need to pull the lower drawer out, as well.
After you have gained access to the igniter...you'll see that it's attached to the main manifold with two 1/4" screws. Word to the wise, here... use a little bit of liquid dish soap on the threads BEFORE trying to un-screw these. This will lubricate the threads and keep them from stripping. If you don't heed this warning and they strip? You'll have to grind them off in order to get the igniter removed.
Wire cutter time... snip the 2 white wires about 3" from the base of the old igniter. Wire stripper time... strip those 2 wires about a 1/2".
Now the old igniter is out. Pull out your new igniter. Cut any extraneous stuff off the END of the wires then strip them about a 1/2". Now mount the new igniter to the manifold (where the old one came from). Now take one wire (doesn't matter which one) from the new igniter and twist it to one of the wires you cut and stripped while removing the old igniter. Then use one of the ceramic wire nuts (included with your new igniter) and twist it on the exposed wires clock wise. Make sure there is NO WIRE EXPOSED after doing this. If there is, remove the wire nut and cut a small amount of you twisted wire pair off.
ALL OF THE EXPOSED WIRE SHALL BE INSIDE THE WIRE NUTS.
Do the same thing for the other wire. Now tuck all of the extra wire away. At this point, you're ready to test your handywork! Set it to bake and watch her light up!
All that's left to do now is rebuild the lower oven, grab a coolada and get some cookie dough. I'll be over at 6:00 for snacks :-)