The re-lo kit for the XL2012C (from the surdyke web site):
Part Number: 67800071
Name: TURN SIGNAL RELOCATION KIT, XL1200C DOM
Description: Required when installing rigid or detachable saddlebags on XL1200C models (Domestic).
I found a bike for sale online that had the kit and I was not impressed. It looked like a long skinny tube bolted to the plate bracket.
However I really like the new LeatherPros. No relocation needed.