Will an LA-360 bolt in where a LA-340 was?

340 & 360 mounts are the same. The 318 is different, and I would really like to know why? I guess the bean counters back in the day were sidetracked and this just got passed them. Now due to this snafu we can't buy the mount for 360 & 340 brand new from an auto store. We have to buy it either used or from Schumacher at a dear price.