2009 yukon drivers seat recline lever broken

I'd have to look to see how it is reattached? I'd probably have to remove the seat, to get a good look. My database doesn't show an exploded view, or I haven't found it? Aren't your seats electric? If you have a new handle, does it have mounting holes in it? The broken pieces, are they steel? Any chance you could weld it back together. In the past I have welded broken seat frame in a vehicle, different year--make--model, I don't know if welding would be feasible on your vehicle. I can't see anything from here.