This Sunlite is very similar to my Nashbar rack.
https://www.amazon.com/Sunlite-Gold-...dp/B002MKHR6G/
But like I said above, if your bike is disc, that rack needs canti brake posts so this would not work for you.
I wonder why Tubus stopped making the Ergo? It fit a bit better than the Tara on one of my bikes, but I think the Tara had a higher weight rating.
I would not say that bike was "vintage", I bought the frame used only ten years ago, it was only a few years old when I bought it from someone that decided that the size was not quite right for him. Instead I would call it "experienced".
Racktime Topit rack might be hard to find in USA, I think that nobody is distributing Racktime racks anymore. I bought a Racktime rack three years ago, shipped from Germany, before that I bought them in USA. Since the Topit does not use brake canti posts, that would work on a disc bike.
I have no idea if this would work for you. The Topit rack has a bigger platform than this. And this you would have to check the geometry of it to see if it would fit your fork. Being steel, this would not be light.
https://velo-orange.com/products/vo-...tainless-steel