LMC fan shroud

[Catch_22]

I decided to go with the mechanical fan as my cooling option and got a LMC fan shroud. I just tried to fit it and the existing fan rubs on it. I didn't even think to check the fan size. It seems I have a 19 inch fan (if I am measuring correctly, tip to tip at its furthest point)

Before I go and order a 18 inch fan as I understand should have been in there, is there anything else should expect? Going to order a new fan clutch too.

Just going to order up this guy with a flex-a-light clutch
http://www.jegs.com/i/JEGS-Performan...52194/10002/-1

Any need for a spacer for a 350 stock application?

Thanks for the replies.