1958 3 spd w o/d t85 trans question
 

I need help! I have a 58 custom 300 with a Borg Warner t85 3 spd std with overdrive. I am having a really hard time trying to locate a 7 tooth drive gear for on the output shaft. Can someone please steer me to where I may find one or at least someone who may be able to send me that direction. Thanks