So I'm trying to put a clutch fan on my small block 69 valiant (to replace the crappy plastic flex fan) and I went to the parts store to get a new clutch. I tried telling them to look up a 69 valiant 318 (which it is) and was told only a $80+ clutch is available that they would have to special order.

Well I figured a 71 would probably have a similar clutch so I told them to try that instead and they pulled up a hayden clutch for $35... tried it and it's too long.... Can anyone clarify what years used what length clutch fans?

I believe only factory A/C Valiants would have used a clutch fan, so there is probably a limited availability. Having said that, I see know reason why a later Duster would not be the same as they didn't use 26" radiators until later which would be thinner using a longer clutch.

Hmmm well this car has a 26 in it (its been hacked) any idea what year you could get a 26?

Most clutch fans are too tall to fit the Mopars..
Especially if one has increased the radiator size, (2) alternatives:
1. Use the Hayden 2705, also Napa can cross this overhttp://www.haydenauto.com/upload/haydenauto/documents/cat_hayden/2007-hayden-fan-clutch.pdf
2. Look for an FC28 online, this is a TRW Mopar replacement, more $ but more like OE.

Just my $0.02...