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KADEE 206 Insulated Coupler Height Gauge HO KADU0206?
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The kadee knuckle coupler on the left is preferred and supports prototype look and operations because the horn on the bottom is metal and by using a magnet you can auto uncouple without having to use “the hand of God” to uncouple.
The numbers of a kadee coupler (also sold by other makers) are cross referenced to height of coupler and length of shaft, and whether truck or body mounted. Some makers provide further info that cross references the number to a specific loco by maker or rolling stock by maker. Once you figure it out, it’s pretty straightforward.
Replacing them can be easy (high quality name brands) or a challenge (copies or clones).
If not sure, a NMRA standard coupler height helps. It’s a plastic block with a coupler mounted on it that you put the rolling stock next to and align the coupler to. Shims can adjust the coupler a little, but sometimes you have to replace w a higher or lower coupler. Alignment ensures no accidental decoupling on curves or inclines. Available on Amazon and well worth the cost.