Okay, using my birthday funds, I got an Ed Brown wide, extended safety for my 1911 (Colt Mk IV '70 Government)
Now I knew going in that "some gun smithing may be required" and yes it was. Hard to describe with the little nooks and cranny's what had to be filed, but for those unfamiliar I thought I'd recount.
The instructions assume you know what to file. They just say try the fit and then "file as necessary". There is an official "gunsmith black" compound that you coat on a metal surface then fit the parts together and where they rub the black comes off. But I don't have any of that so I used the very next best thing. Soot. Using a small candle (this only works on metal things), I passed the safety through the flame till it was real sooty, then assembled it as far as it would go and wiggled it. Sure enough I could see what was rubbing. Slow use of some small files, flat, triangular and rounded did the trick as I tried to make it look just like the original. Took four "sessions". Then I took a soft pointed, tear drop shaped stone on my Dremel tool to remove all the tool marks.
I didn't try to blue it, but just coated it with a Hoppes lubricant for internal parts. Works great. So much better than the original.
To date (over 38 year period) I've put in a pnematic buffer, a flat mainspring housing, plastic checkered grips and high adjustable sights. (have all the original parts)
Just thought I'd share for other thinking about making some mods.
Oh, the candle soot works well for blackening metal sights to make them sharper to see.