Bluejacket does sell them - in four sizes. Just go to the Bluejacket website ( www.bluejacketinc.com ), go to the "Fittings" section, then to the second page of deadeyes.
These are good fittings. There is one problem with rigging deadeyes like this, though: you can't control the distance between the uppers and lowers. Depending on the individual ship, that may or may not be noticeable. On a ship with two or three or four shrouds in a gang, the gap will be negligible. On a ship like the Constitution or the Victory, the aftermost deadeye/lanyard assembly in a gang will be considerably longer than the foremost one.
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