we get ours from a mitsubishi TR magna, its the radiator fan motor. but you can get ones that are about the same diameter much taller and with a similar spinning plate out of 1980s ~ nissan pintaras and skylines.

thanks chris, be very interested to see your plans , the angled shell im obsessed with at the moment as you can tell lol, it may be a b*ztch to make but its worth it.