Butch and George.

My suggestion for accommodating all sorts of starters
is leave the starter mounting area blank and let people
cut their own starter holes. A 2 5/8" hole saw is about right
for the large pilot hole and they can match drill the hold 
down bolts.

Provide instructions on how to locate the large pilot hole  
based on the gear root diameter of the ring gear used and the OD
of the starter pinion gear of the starter they want to use.
They can measure over from the machined center hole.

Minor adjustments can be made with a die grinder.
 
Paul Lamar
 
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