I modified an aftermarket 6 blade aluminum fan to fit the water pump pulley. If you lay the original fan down on a table side-by-side with the 6 blade fan, the 6 blade fan is just slightly wider than the original, but not by much. Basically the pitch of the 6 blade fan is the difference.
I don't think it will be an issue, but just asking if anyone has ever experienced this issue.
Thanks