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Castle head style lock nut in picture is what I have seen.
Chris...the ones in image 1519 are the typical style you see on the earlier spring perches.
Are you sure? They say concourse special nuts w/ original seat part # 3388-1AK. The bolts are original, it is just the nuts that were replaced on the driver side.
If the metal is not all pitted I would suggest having the originals restored . I just got done restoring some nice cores. The typical replacements look different in appearance. It is involved process and may not be appropriate because of the effort or expense (if you pay to have them restored)for a driver car or where function out weighs originality.