I went to ACE Hardware a few days ago and bought 4 5/16 -18 u-shaped clip nuts, 4 5/16-18x1.25 SS hex button head bolts. I reused the flat washers from the OEM dsuz fasteners. Total cost was ~$6. Took 15 minutes of time to remove the bags, remove the dsuz fasteners, install the clip nuts and the saddlebags. put a dab of blue Loctite on the SS bolts before inserting them. It may not be theft PROOF (few things are), but I feel it's theft RESISTANT.
2011 Electra Glide Ultra Limited
[psychedelic purple/vivid black]