You can find the "gray with colored trim rings" type binding posts on ebay. They are hard to filter because there doesn't seem to be a standard way of describing them. I have bought from a couple of different sellers and the items received appear to be identical. The quality is fine. The metal post is not cross-drilled. The gray color I received is only close*. The lightness is similar to the Agilent, but is of a slightly browner shade, more like the HP color. If you are really picky about the color match, you would probably want to buy a matched set from Keysight. The last time I checked was about 2 years ago, and the cost was nearly $50 for a set of three.
* point being, you are not likely to get a perfect match as the color probably varies a lot from batch to batch.