Casement window 'T' handle

I have Truth operator arm with Hurd crank handle. Replacing the long cranks with the 'T' style so blinds clear the handle. The long cranks llook to be 3/8" ID. The T's are 5/16"ID. But I can interchange them with no problem. I'm looking for metal T's thatvhave a wingspan of @ 1 3/8" with height of 3/4". The T's I have do not have a brand mark. I need 4 T's.