These attachments have an easily stretchable tube that is plugged onto the earpiece.
According to manufacture with the following diameters:
Width/Diameter at proximal end (end attaching to device):
Small: 10.67 mm ± 0.50 mm (0.420" ± 0.020")
Medium: 12.45 mm ± 0.50 mm (0.490" ± 0.020") -> Check your E8.
Large: 13.97 mm ± 0.50 mm (0.550" ± 0.020")
I am totally enthusiastic about these things, I can only recommend them.
