The earpiece speaker may have a 'rubber ring' glued to the front side. The new display assembly will probably have one of these already installed in the earpiece socket, covered with a protective orange ring. I peeled the old 'rubber ring' from the old earpiece, and then put the earpiece into the new display assembly. Old ring went back into the old display. But I guess you could put the new ring into the old assembly, and then you don't have to peel the earpiece apart...