Anti Rattle Springs

I am looking for some anti rattle springs for 11" drums.
Does anyone know of a part number I ordered some from Napa but they were too small to fit over the struts.
I found some from RockAuto but they say they are for 10"X2.5" drums?
Or if anyone has any that would be good also.
Edit: AKA Parking Brake Strut Springs


1968 DODGE CHARGER 6.3L 383cid V8 Parking Brake Strut Spring | RockAuto