I see that Silvam is getting close to updating Yankee Stadiums. I went ahead and updated his updated Shea 64-78 for when the Yankees played there in 74&75. Basically just replaced the Mets sign on the scoreboard with a Yankees sign.
The file name is Yankees@ Shea-1974-1975_v1_4.
You can get it here:
http://www.mediafire.com/folder/akd2ejkdtk4dx/Historic