Filling the hole

In the former butler's pantry (now part of the new kitchen) there was a hole in the wall  We were told that the the hole was made by the former owner for a window air conditioner.  The old casement windows have openings that are too small for an A/C unit to fit, so they tore out a 2'x2' hole in the the 14" thick concrete wall.  When we bought the house the hole was covered with plywood on the inside and outside. 

We removed the plywood to do a permanent repair of the hole.  When we removed the plywood we found this:

We decided to fill it back in with concrete block.  The challenge was that the concrete block made in 1925 is sized different than today's typical 8" or 12" block.  We had to trim 8" block to fit the opening.  It took a little time and trial and error, but we ended up with a pretty good fix.  We're going to have to add a layer of brick to the inside to make up the difference in width, but it came out pretty well.  A nice layer of stucco on the outside will make it perfect.