Marsh Rat,
Maybe, but first we'd need to know what's on it now to be able
to figure if it's possible.
Just because the "book" says X or Z doesn't mean those other
sizes will even work that are shown is set in stone. Many times
it's been my experience that the other factory options listed also
had different gear ratio's in order to put them on. Just had one in
the last 2 weeks that wasn't even close to being correct with the
optional tires listed without also changing the front and rear gears.
Please let us know what brand and size tires you have on it now.
Al