12mm wire rope to swaged and non swaged.....fittings ??

[Kalu 1957]

Hello all....Quick question for the swaging part of the community....I have some excellent condition 12mm wire rope that I would like to use as part of the rerig of our schooner.....WHile I have been told that it is the equivalent to 1/2" wire I am concerned that the 1/2 inch swaged fitting appears a bit big to swage on(it just sorta slides on with a ton of space all round for a dry fit) and the 7/16" won't go on although it is Verrry close to grinding on.....soooo would it be necessary to try and find all MM swaged fittings(eyes and forks) and the appropriate 12 mm fitting for the press equipment(wireteknik.se)?? On the non swaged fittings it appears that the 1/2 inch should be AOK?? Your input would be very much appreciated!!