This is the number one source for retro FIFA modding. Enthusiasts there have reverse-engineered the CD key algorithm to generate valid keys. While not "official" exclusive keys, they function identically to retail keys.

Fifa 2005 Cd Key Exclusive ((hot)) ✦ [PREMIUM]

This is the number one source for retro FIFA modding. Enthusiasts there have reverse-engineered the CD key algorithm to generate valid keys. While not "official" exclusive keys, they function identically to retail keys.