Viscous Fan Won't Fit

When I did the swap I bought a replacement radiator for a Duster 340 from Pep Boys. While not correct in appearance it fits and functions as the original would have. Don't know specific dimensions though but it has the big tank on top like allot of later A-Bodies did. Only deviation is the slant six shroud which does fit around the 18" steel fan and my 18-1/2" viscous unit.

I have an old bubble style wheel balancer, might be able to make a template to notch each blade fairly close and then check it for balance. You can't see it in the picture but I had already scribbed a line where to start cutting them:) I noticed all the pictures in my mopar book showed some early fans with the notches, I always had thought that was for noise reduction not clearance.

Flex-A-Lite makes a generic replacement 18" 7 blade viscous fan that does have the tips notched but from the picture looks like not enough. I think the part# was 5718.

I am guessing looking for a factory 340 clutch blade is like looking for a needle in a haystack.

Thanx for the inputs.