Agree with Unspec. Assuming no damage to the main spring you should be able to get the helper spring and the plastic spacer from KW as a replacement part.
I just got a set of used V3 for my XDRIVE as well, and needed new rear threaded collars and all four dust boots. Parts from KW were reasonable.
I would also consider a new rubber spring isolator. If the spring has been improperly clocked with the weight of the car on it, it could be damaged. I would give that particular unit a good check for other damage while you're at it just to be sure the spring never got dislodged completely and scratched the damper shaft or something.
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