Seriously, I jacked mine up and had no play in the wheels/hubs.... I said f@ck it and did the kingpin bearings anyway and I'm glad I did because they were rooted.
I don't reckon you'll feel any play unless its ridiculously bad and I'm not joking when I say mine were rooted.
It's possible that the wobble is another issue previously masked by the swivel hubs in the past. Since I did mine, it's like a new car.
I'd take it back and tell them to fix what they screwed up.

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