Correct, I was looking in the mechanical catalog and since the ls400 is the only one in the 400 class with actuators that's all that came up. Technically the gs400 doesn't have actuators, it's considered a lock assembly and in the collision catalog.
ABQ, If you're going to buy new ones and are going to throw away any of the old ones, I'd like to look at one and see if they are really not repairable. I'd be willing to pay for shipping. This is a common problem that's pretty expensive to repair. I'd like to see why they fail and if they can be repaired.