Honestly, the wing mounted mirrors are a losing proposition. Every wing I have owned (8 wings over 2 restorations) have had at least 3 holes where the mirrors were installed, broken out, relocated, broken out, etc. There is too much vibration for 18gage steel to support. Now, if you could mount a steel backing plate to distribute the load, I think it would be more stable and hold an alignment better...but that is something you would have to do during a paint job.