parking brake lever/strut question

ok, I have the 10x2.5 rear drum brakes and I am missing the parking brake/lever that goes between the shoes. I need to know if there is anyway to tell which type I need. There are listings for i think 67-72 and 73-76 and they are totally different, here is a picture of what I have if that helps.

16820198341257301555550237314195.jpg