They do look nice and like they belong. Naturally, they or the rear seat need to be retrimmed to match and complete the transition, black is easier than most to get away with.
Do they completely flip forward for rear seat access? Or have to recline all the way and slide them on the tracks? If my seats weren't already retrimmed I'd have looked into something similar, or at worst trying to add bolstered side cushioning and reshape the covers, for the little extra that would provide.