which mb bracket do i use

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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 ...
The 419 panel adaptor is the replacement for both the obsolete 145 shoe, and 418 panel bracket (both were made obsolete in 2009). The 419 panel adaptor is 4" wide, 2" tall, and projects 3". ST-069...
When using 98/9927 with flush transom above: You will need to use a 260U strike for flush transom applications OR a 260U-F strike for 98/9927-F fire rated device.