sleddermb - you will be much better off buying the parts needed to upgrade the skis you have to the '06-'07-'08 mountain skis. It is far cheaper than buying a new set of skis. You have to buy the ski bottoms, new bolts and washers, new rubber shoe. You can reuse the stock ski loop.
The old '03 mountain ski is not a very good ski. The Yamaha mountain skis from '06 or new are some of the best mountain skis out there. I have a set ready to be installed in my RX-1 turbo 136"