This is the ingitor you will need, the electrode you will need depends on the burner you have in your grill. Give us a call, we will be happy to assist you in finding the right parts!
Yes, this will replace that original rotary ignitor on your Viking VGBQ412-2RSLSS. The knob may look slightly different from your original Viking OEM part #PAO20023. However, the connections are the same so it should fit and work just as the original did.