Paul from SWISCO responded:
October 19, 2021
Our 95-266 corner key's dimensions seem similar to your old corner key, but compare them to yours and see what you think. The outside square is 11/16", thickness is 3/8". The inside leg is 5/16" thick and the short side is 3/8" and long side is 1/2". It only comes in Eura white |