Thank you, that was what I was looking for.
In regards to the Halifax batch/flight II I was referring to the original plans to build them 9.4 metres longer so at their mid life refit they could be fitted a Mk41 VLS with RIM-161, APAR and SMART-L. I found reference to this plan at hazegray.org, global security.org and Wikipedia as well.
https://en.wikipedia.org/wiki/Single_Class_Surface_Combatant_Project
http://www.hazegrat.org/navhist/canada/current/futurddg/
http://www.globalsecurity.org/military/world/canada/hmcs-csc.htm