Plug wires need to be replaced on both my 84's. I did a search here. Some info came up. Any advice on where to get them and tips do's and don'ts most welcome. So far I know 7mm copper core non resistor.
What I bought was a used pair, you won't find a new pair for the price I paid. Make sure they test out for you or get something in writing that says they did test properly before you lay your money down.