Hey Joe, the 5-hole sprocket with the 1.4 inch (nominal) center hole is what we had when I convinced Grube to do something about those PITA sprockets. WHY? says he, they fit just fine, EVERYBODY over here uses them.
I supplied the measeurments of every Coaster I had in my collection (all the way back to Bendix!) and from my insistance and measurements (and one other guy I've heard) the 9-hole sprocket had it's tooling paid for, and came to life.
What does the 5-hole fit? Well it obviously fits the 40 spoke, rod brake China-bikes, that are copies of the old Raleighs.
If you don't have one of those perhaps you'd like to see mine?
28x1.5 tires, narrow rims, rod brakes, built-in lock, Black color only, leather saddle, full "chain case" gold leaf lettering, just your basic China Bike!
Mike