BS75K3203203.5 BS75K-320-320-3.5 BS75K3203204.0 BS75K-320-320-4.0 BS75K3203204.5 BS75K-320-320-4.5 BS75K3203205.0 BS75K-320-320-5.0 BS-78.125MBB-T BS-78.125MBC-T