I have been fixing up the daily driver 67 Camaro and finally getting the heaters sorted, they were filed up with mouse food/nests and the flaps were stiff and there was no airflow so a complete job was needed.
Fenders off, boxes out, shop-vac used, then a dip in the disinfectant bath for a day or two and its all looking better.
One of the things I found was that the rodents had eaten the plastic fan cage so today I removed its remains and put in the used tin one I had in stock.
Closer inspection of the remains of the old one showed a part number and a Hurst logo.
Did Hurst make fan cages for GM back in the day ? I am sure as I can be that this car has never been taken apart, all the sealer and nuts look totally undisturbed, the core was a Harrison that matched numbers with the car pretty well so I think this is original.