Have the box lock on my universal Winterhoff WW30 and fits ran. The box lock is massive - no thin aluminum sheet. Discus lock is part of it, that's ok too.
TIP: Because the discus lock can only be mounted vertically, the lock should be protected from the weather, at least, because the water collects in it and freeze in winter - can say from personal experience that the then no fun makes to open it.
