I thought stock (early at least) was 225/30/16...?
No, I don't think they make a tire that short (that would only be 67.5mm tall off the rim). The factory size for all SC's is a 225/60/16. The 245/50/16 will fit, they are just a little shorter than stock (I ran them on my 35th for a year with no problems and I loved them, then they got moved to my SHO).