Viscous Fan Won't Fit

here is my wifes setup. this is a 340 fan exact same number as my 72 demon 340. i have this installed on my wifes car which is a 318. this setup is a 71 22" 340 radiator. a 71 340 shroud. the fan came from a 70 4 door dart with a 318 and ac. the fan is the same setup as my 70 polara with a 318 as well. so as you see it is not that hard to find one. i forgot to mention i had to do no mods at all to make this setup work. i unbolted the stock fan (5 blade non clutch type) and radiator.then installed the new parts w/ shroud.

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