The plan is to add spacers and 2 1/2″ screws so the lock will fit correctly.
When I was trying to install the spacer I broke my wrench. Of course this was the only socket that fit and I have an incomplete socket set. What bad luck. I learned some more important lessons today: 1) Drills can catch when drilling steel. I have a busted finger to prove it. 2) A vise would be nice to have because pliers can slip off the steel and get caught in your shirt and bruise and cut your boobs.