Don't want to lead you astray here, just remembered some additional info. The Post 25 fitting 16001 is a larger nut style 3/8" and not the same as original. The only place I could find the original 5/16" nut style shown on post 26 was from: Part number 0650 111200 B.E. Atlas (773) 283-2550 in a pack of 5. Didn't want you to be disappointed when you get the new one, cause it looks different, it will work fine its just not the same as the original.
Hey Todd sorry for the Hi-Jack but I just noticed that we have the same cam. I have not installed my motor yet, but I am wondering how you like the cam?