Replace operator

One of my handles has broke off,i it seems that has taken part of the crank (see broken arm picture) for what I understand i would need to replace the whole operator. Would you please point me to the part I would need to buy (picture of an unbroken one shown as well. The arm says " truth hardware, anderberg mfg" but I guess that's the company name. No idea where to find more information to give you!