[Wayne 962]

Different tire manufacturers have different sizes of tires, even if they have the same spec (i.e. one brand of the same size tire may fit differently than another brand of the same sized tire). The sizes you mention *should* fit - the 19" wheel uses a lower profile tire to keep the outer circumference of the wheel the same. I had 19" wheels on my 996, but I took them off and put back 18" wheels on, as I didn't like the low profile going that thin, and I also didn't really like the looks.

- Wayne