Put mine together this morning, had the same charcoal grate.
That and the door was a little out of shape (which didn't take long to make fit correctly), where the only issues I had.
I'm not worried about the grate, I'm gonna use the one they gave me.
Cool thing, took it out and fired it up for some ribs, never touched it in two hours so far, holding temps at 225 without even trying.
I'm gonna love this smoker!