What model 1911 ?
I removed the sights on my NP29 yesterday.
The front dovetail base width is approximately .245" .075" depth, didn't calculate angle. I have looked everywhere and every sight I found had a wider base width.
The rear dovetail base width measured approximately .323" .100" depth, didn't calculate angle. This rear sight will fit
https://www.fusionfirearms.com/part...sight-colt-gov-series-70-80-90-black-serrated
The above sight can likely be ordered from
http://practicalperformance.ca/gun-parts/colt-1911/ as they stock other parts from Fusion Firearms.