late4lunch

Hi, I have 1997 ES 300 and the keys were lost. My husband bought an ignition lock cylinder replacement, but in the process of removing it broke a plug that was attached to the ignition switch. First what does this plug do, and can it be glued back together and used or does he need now to get a new plug? Also is this an easy procedure putting in the lock cylinder and new ignition switch? Please help immediately, we are getting nowhere!