I would like to replace the original vanity with one from a big box store. The original one is flush with one wall of the bathroom, and I'd like to put the new one in the same place. The new vanity top would be flush w/ the wall but the side of the vanity has recesses so there would be a small vertical gap. Does code require that I fill that with a filler strip? Photo below shows an example of a vanity where the side wall is not a straight line, and is recessed horizontally relato the marble top.