There are 2 diameters of 9 hole bolt patterns for the rear sprockets
the Grubee style is smaller than the PK / RAW style
the Grubee style I have comes with 2 metal rings with
one for the inside and one for the outside
One 3 piece 3 hole metal ring
One 2 piece 4 and 5 hole metal ring
I sell the Grubee Std. Sprocket installation kit 6mm 9 holes; for $10
the Andyinchville sprockets include all 3 mounting hole patterns
which include the 6 bolt disc brake mount and the 2 different
9 hole diameters