No no, maybe I have explained it wrong. I am just learning english
My x5 had forward drum that was meant for 3 clutch pack pairs an 3 were correctly installed. But it burned to the point of metal melting toghether.
Junkyard one has slimmer coast clutch drum that allows one more forward clutch pack pair to be fitted while maintaining same coast clutches amount. It is stronger part ( maybe later reviesion ? )
I will use the one that holds more clutches, hopefully it will help