Can I get an '03 CDI and just connect that to the wiring harness?
Yes - the 03 was the same unit - the CDI unit was the same for the following models
2003 500 MAGNUM 4X4 HDS A03CD50FB
2003 500 MAGNUM 4X4 HDS A03CD50FB
2002 500 MAGNUM VL HDS A02CD50FB
2004 A04CH42AA SPORTSMAN 400 A04CH42AA/AE/AG
2004 A04CH50AA SPORTSMAN 500 A04CH50AA/AC/AE/AG
2004 A04JD50AA ATP 500 4X4 A04JD50AA/AB/CA
2004 A04JD50AA ATP 500 4X4 A04JD50AA/AB/CA
2002 ATV PRO 500 4X4 PPS C02CD50AC
2002 INT'L BIG BOSS 6X6 A02CL50DA
2002 LUH 6X6 PPS C02CL50AB
2002 MAGNUM 500 A02CD50AA
2002 MAGNUM 500 2X4 HDS A02CB50FC
2002 MAGNUM 500 RMK A02CD50AB
SERIES 10 PTV 4X4 C10CD50AA
SERIES 10 RANGER A10RD50AA
1999 RANGER A99RF50AA
SERIES 11 RANGER A11RB42AA/A11RD50AA/AB/A11RF50AA
SERIES 11 RANGER A11RB42AA/A11RD50AA/AB/A11RF50AA
SERIES 10 RANGER A10RD50AA
SERIES 10 RANGER 500 6X6 A10RF50AB
2002 SCRAMBLER 500 2X4 A02BA50AA
2002 SCRAMBLER 500 2X4 A02BA50AB
2002 SCRAMBLER 500 4X4 A02BG50AA
2003 SCRAMBLER 500 4X4 A03BG50AA
2002 SCRAMBLER 500 4X4 FREEDOM A02BG50AC
2003 SPORTSMAN 400 A03CH42AA/AB/AC MAGNETO - A03CH42AA/AB/AC (4975277527D12) 3087169
2002 SPORTSMAN 500 ALL OPTIONS A02CH50
2003 SPORTSMAN 500 HO A03CH50AA/AB/AC/AD/AE/AH/AJ
2003 SPORTSMAN 6X6 A03CL50AA
2002 SPORTSMAN 6X6 A02CL50AA