Not sure what you mean by aluminized. On RA, they don't specify anything special except for heavy duty and front or rear shafts. If you have an aluminum shaft, it's still whatever joint that's specified for it.
I do have an aluminum rear shaft & thought there was a special joint for use with aluminum shafts it is the rear shaft I need joints for I think they are spicer 3-3147 but don't have time to drag out jack , so I can get a better look