We do have issues with those. We had Doyle make us custom doors with the welded mounting studs and were only $45 each.
That's funny! When I did my retrofit, Doyle didn't have doors with the Studs and opening for the LED 7....I bough the door blanks and machined them up myself. I told them at the time they were missing out on a retrofit market...They must have listened! LOL!
Never had any issues with the timer cases themselves degrading at all and I have some pretty old ones.
Now that you mention it, I've never seen a Dixmor case degraded from sunlight unless there was no protective lens on it at all.