I have made posts for some old Grand Compe center pulls that are super light and sleek and have cartridge bearings in the pivots. Making the pivots was a bit of work without an existing pivot to measure - someone with CAD skills would be able to knock it out in an afternoon, I'm sure. Then you still have to deal with the spring attachment. I received a couple dozen random posts as part of a 'donation' from someone a while back but nothing that looks close. Otherwise, I would recommend posting in the google group that you're looking for the posts and see what turns up.
EDIT:
DIA-COMPE GC610/GC700/DC750 Center Pull Pivot for Rear 2010004005114 | eBay
this seller seemed to have the spring kit as well.
WP_20150725_001 by
Duane Draper, on Flickr
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https://www.flickr.com/photos/54319503@N05/
http://www.draper-cycles.com
Last edited by duanedr; 08-04-21 at 05:36 PM.