The springs have pretty much the identical part number to the H&R Springs for the 300e. Not sure if they match with the 400e, but I think I remember that on H&R's site the springs for the 400e were the same, but not sure on that, so don't quote me on it.
From my understanding, Neuspeed used to contract H&R to make their springs for them, before H&R decided it wanted to sell springs int he states. Not sure ont hat though, but I believe thats what I have read.
I'm getting my neuspeed srpings installed on my 300Ce next week.
I can't wait.
At the price they were at, if they wont work, then I can always sell them, and probably for a profit too.