Lynn, I don't think these are the same mirrors that were on ACCO's, they were similar but larger. However, if we were selling ACCO's to NZ, we probably fitted them up with all the out of date CMP spares just to clear the warehouses!
Those convex mirrors must have been quite a problem, as most ACCO's were fitted with larger flat "Truck style" mirrors through the 80's (pictured ACCO Mk3)