I appear to have lost that plastic spacer that goes between the bolts that tighten a non-driveside hollowtech crank to the axle. What does it do? Do I need it?
Assume you are refering to part number 4
Stops the crank from wandering off the arm if you don't tighten the bolts down enough, and prevents you from tightening the bolts too much.
No, you don't need it.
@Jon. started
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I appear to have lost that plastic spacer that goes between the bolts that tighten a non-driveside hollowtech crank to the axle. What does it do? Do I need it?