I own a 2001 Grandeur and would like to upgrade the headlights to the mirror finished ones available on the 2004-2007 XG 350 models. I believe the enhancements made on the 2004-2007 models were strictly cosmetic. Can I safely assume these parts would fit my 2001 model? I also want to upgrade the steering wheel to the burlwood finished one. How much trouble would it be to take off the airbag,replace the steering wheel and put the airbag back on? Thanks for your help!