That single lower starter bolt is different than all the others for some stupid reason. "Some Fucktard at Mazda...." Was the way I heard the first time. Never will forget that quote. Cause it's sooooo true. Anyway I think its a 1.50 pitch same size as the rest but just the pitch is different.

the cross member is 14mm i had my car torn apart, and installed it last week

thanks.