You are right about that Cig lighter ring and mounting puzzle. I worked on mine longer trying to figure out how the heck it was assembled than I did actually installing it. Even with a mirror and a flashlight I could not see those little alignment tabs on the ring when it was still in the tray to release it.

When I bought my X5 the ring was broken but the lighter was still in the slot. Loose but there.

It was not straight forward like any mormal maintenance challenge...Brakes, suspension, exhaust, cooling system etc. Cheap part though, so it makes up for the brain work.

Keep the posting of any projects as this site needs some more technical postings.