Oh , thankyou Jerry, I just missed your comment. Yes thats correct. Yet they have been sitting there for 70 odd years. I was just trying to see if anyone had seen this particular block before as it is quite unusual.
To be set properly they would be taller than they are wide, which is also a defect as far as I'm concerned so which is right.
Bad design, bad install, typical day in the trenches. Thanks again, wayne