Dr. Zoidberg is correct.
Before 1998 K11s had 13 inch wheels, the tyres were 155/70/13 on all models except the Super S/SR (or had alloys as an option) had wider ones - 175/60/13.
Models after came with 14" wheels, but I'm not sure which size tyres they came with.
Also, I believe if they were universal wheel trims they do not fit. I had this problem with my K10 about 2 years ago.