MB bracket for COr series

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Those holes are for mounting the coordinator mounting bracket itself.  The brackets must be drilled and tapped for the hardware you are mounting to them.
When using the 4111 with a bar style coordinator MB-mounting brackets ordered from IVES are required. The brackets wrap around the coordinator to provide a surface for mounting the parallel arm ...
End cap without end cap bracket is 968601. End cap kit with bracket is 900981 End cap bracket is 971795-89