Check out Great Lakes Skipper either their online store or ebay store. They have a ton of hard to find OEM MC decals. I just picked up a transom set for my 2000 x star from them last year.
CURRENT: 2008 SANTE 210
2000 Mastercraft Xstar
2004,2005 Ski Centurion Avalanche C4
2003, Ski Centurion Cyclone
99,2000,2001, 2002 Ski Centurion Elite V/Hurricane/lightning
88 2001 Nautique