Can anyone identify this part on the swerve X flipped modules?
Those look like spacers, kind of near the end here:
Those are spacers to hold in the pinion gear. The top of the Kraken shaft is tapped so the spacers are retained by a bolt.
what @FinIce said.
If you want to get specific.
I believe it is quantity 2 Part number: WCP-1405 1/4 inch spacers on each shaft.
These should be pretty easy to make yourself, or at least a functional equivalent.
You could likely use a stack of small OD washers (as long as they do not hit gear teeth on the mating gear) or 3D print your own.