Product review (5 stars): Whirlpool Back Right Igniter
Worked great as OEM replacement.  Procedure as follows: Unplug oven.  Take 4 upper screws out of back of control unit after removing safety chain.  Pull plastic sides apart far enough to tilt controls back to expose igniter pack.  Insert new igniter cable through range top hole, cut old igniter cable, tape to new one over spade electrical connector, pull through to igniter pack and plug in where old one plugged in.  Put all back as found, done.  Already had done this process for two other defective igniters. Could have replaced all 4 in about 30 minutes.  Good luck.