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It had to be special ordered and for some reason they came up with three separate items. Two of them have arrived. One has not. I have no idea why.
Weird. And not awesome.
You have three options:
cancel this order. Order a complete 165mm crankset. This will be easier to acquire than the arms and associated bits only. You should be able to get a fairly specific delivery date for it although it's a concern that there are non available here
find out if it's a NDS crank that's missing and plug the gap with a stages
keep banging on at Evans who will need to keep banging on Cannondale UK (CSG)
Can you?