Thanks, all. I omitted to say in the original post that most of my stock is Bachmann with the low-mounted couplers, and the K-27's offset coupler was fine until I bought an AMS coach, which rather complicated things! That's why I was looking for ways to raise the coupler height on some of the older stock, rather than just use the offset couplers supplied with the K-27. I wasn't aware that Kadee made a suitable height-adapter coupler to fit the 1:22 stock. Adapting selected vehicles with those looks like the best solution - thanks again.