I checked my copy of the 39G219 lead, and there are no markings at all on the coax segment going to the red ez-clip. I would think it’s a bit of the luck of the draw on such a short bit of cable, since the raw stock they pulled off of to make the lead is probably only labeled every six inches or so. The goal is to keep the overall capacity of the cable low enough to be within the auto-cal range of the analyzer (assuming an LC102). For that short section, I think you could get away with a replacement that fits the physical description of the original. It does need to be able to withstand 1000 volts from the leakage test function, though.