the holes in crank are for a different pilot bearing & flywheel setup -
. 915 type FW for 3.2 crank - you can read the FW number in picture
. pilot brg for that 915 setup
. later G50 style
. Pelican sells all of the types - i recently got them both from here
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"... I am German, and if it has no logic it's meaningless."
914 & 914-6 parts FS 03-2021 
www.tinyurl.com/2pmpmv8y
911 parts FS 2022
https://tinyurl.com/911-Parts-FS-LCM