For those of you who are looking to install the mountain skis on your 03/04 Mtn, I just installed them on my 2003 Warriorized RX-1.
The parts you need are as follows:
8FK-F3711-00-00, Ski, 2x
90105-10106-00, Mounting Bolt, 2x
90387-10036-00, Sleeve, 2x
90387-16013-00, Bushing, 4x
If you refer to the Yamaha online microfiche, they are parts 1, 11, 13 & 14 respectively. You can re-arrange the bushings to adjust the ski stance afterwards.
The upgrade costs about $300 CDN for the whole shebang. I re-used my carbides & ski-loop and it looks great.
-JS