Perry.
The Carriers No. 22 are actually an asymmetrical piece, which from the factory had the front face of them clearly identified, as per the attached photo of an NOS Basic Carriers No. 22 in my possession.
On the left side, the two main rails extend exactly 2.5 inches beyond the angle. On the right only 2.0 inches. My guess is that this was a critical clearance for many installations using this item.
Two versions of the Carriers No. 22 exist. The Basic like this one, and a second version (under a different 'PC Number') that could be ordered complete with the appropriate canvas hold down straps, cushions and Mounting Bridges. Cannot recall that PC Number at the moment.
Hope this helps.
David
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