Hello Cynthia, any of our corded electric kits will work with your system and allow you to shut off the electric brush head. You can only shut off the suction if you have the vacuum port holes that have the two small metal contacts inside the hose hole. If your suction starts without the hose being inserted then you definitely don't have that type. If your hole's diameter is 1.25 inches, not 1.5, you also don't have that type - you will not be able to turn the suction on/off at the hose handle. Regardless, we recommend any of our electric kits. Read the text at the Electric Kit section on this page. We have kits that fit right into both sized wall ports https://builtinvacuum.com/help/kenmore/kits.html
. Also, sorry to say, you will not be able to update your 1.25 inch diameter faceplates to larger more convenient ones (unless you want to open up your wall), but having an excellent tool set such as the Stealth will make a huge difference for your cleaning.