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You may want to contact your local NCRS chapter and see if they have one you can borrow.
The local chapter I belong to keeps/owns a full set of the tools needed to completely rebuild a C2 trailing arm as well as the front spindle. That includes the tool you have pictured above.
Bryan, since you have the tool you might set up a service fee so we could send the arms to you for repair knowing a fair cost and proper installation. Not a business but a member helping members for an agreed donation fee? Your time and effort plus the proper tool is worth it.