The Part number is NEC ND487 ..... Kenwood & yaesu have there own number for that BDM , I would call Yaesu if you want that part... There the cheapest ...Radio's that use it are FT-757 & FT-767 ....Both use the parts for product detectors..... Kenwood use's it for Balance modulator ..... Hope that helps you or at least give's you an option !! 73 John