Ummm....have you checked Lowrance? They still have "legacy" products on their site. And you'll have to refresh my memory, but those are blue plugs right? If so, those cables are readily available...Cabelas, BPS, Gander, Thorne's, Reeds... I'm pretty sure the ducer at least is a blue plug...the HST-WSBL  I would assume pwr/data is too.  Heck, I have three or four spares in my garge.

But here's the whole list of cables and accessories straight from Lowrance- http://www.lowrance.com/Products/Marine/Full-Size-SonarGPS-Chartplo...