Hi NoPepper, as I discussed earlier with you about sharing your mod, we have added your resource to our brand new forums. You can find your three links here
OOTP - Historical Uniforms (1902-1997) American Association - GM Games Forums
OOTP - Historical Uniforms (1901-1970) National League - GM Games Forums
OOTP - Historical Uniforms (1901-1970) American League - GM Games Forums
Should you wish to become the custodian of these assets, I will make the change of ownership for you.
Cheers