Stanton 1805 / 2005 Vs 10F concrete brackets

Here are two very common concrete brackets by Stanton & Stavely. The top, longer bracket is for their 1805 or (same design, but later) 2005 5 metre concrete columns. These are the pencil-thin 8-sided ones.
The bottom, shorter bracket is for their iconic 10 Series 5 metre columns. These are the 8-sided ones that widen to a square 4-seded base. They are slightly different in length, shape, and weight. There is a version of the F type bracket for top entry, but I think the 1805 2005 brackets were all side entry only. If a top entry lantern was installed on these columns, a top entry type F bracket was used.