I'm not exactly sure what's being said about the confusion with the mounts and part numbers here, but the LEFT mount (car's left side, exhaust side) on the SR is different from the KA mount. Some Nissan left mounts are labeled LH and some are just L. You can see the heatshield that goes on the left mount also has 2 siamesed holes in it for the mount bolt and 2 locator pin holes. That's so it can fit either an LH mount or an L mount.

IIRC, the KA uses L which has it's bolt about 3/8" further rearward than the LH mount. 3/8" doesn't sound like much but it definitely makes a difference in ease of engine installation. This is also the reason why people who swap SR's always have left side mounts go bad (prolly also coupled with the fact that the left side is the torque tension side).

Hope that helps, I'll try to find the thread I posted on FA with pictures of the 2 mounts side by side.

-Sean