It appears that all the white VXes offered in the US were Ironman editions (99-01):

They included:

Factory Yakima Roof racks
Embroidered Ironman Seats
Embroidered Ironman Carpets
Hood Insert Decal
Side Pillar Decals

This edition was a tie-in with the Ironman Triathalon and was also offered on some Rodeos and possibly Amigos.

-- John