Sprocket ?

#1
I'm going to purchase a new 72 tooth sprocket and can't figure out how they measure the bolt spacing. My old is a #35 60tooth and has a 2" center hole and I think about 2 1/8th inches from hole center to hole center on the 4 holes that hold the sprocket to the hub...

Does this sound like your average old sprocket that any 2" center hole would work on?
 
#2
Measure across the center, from hole center to hole center. That will give you the circle measurement, then you'll know what you're looking for.
 
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