Those are the correct pads for the Surly LHT.

If you currently have cantilever brakes, you might also consider changing to V-brakes. I use the early 2000s XTR parallelogram ones on my touring bike but they are very expensive now on eBay.

If you do change from cantilever to v-brakes, you will need the below cable pull ratio adapter in addition to the brakes.

https://problemsolversbike.com/products/travel-agent

Knock offs also available on AliExpress in case you can't find the original locally in Japan.