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This is the best I can do. This is a pic. of the frame on my 72 and as far as I know 72 was the first year for the small brace you are asking about. Hope this helps.
Thanks - I am talking about the rods. Thanks for the clarification. I see in your recent pic there are 2 holes in the rear portion of the frame. I believe it is the outermost hole, as the only hole my frame has is about 2.5" inward. I did checked it out a bit more this morning and I do have the correct rods.
As for drilling the hole - the time for doing that was when the body was off - but I can still get to it and will have to work with a dremel to round it off nicely.
And I guess your link answers the availability for years 72-73.