I made my own for my 83 lp5000s. I purchase two sets of msd solid core v8 universal sets with straight boots. I cut the wires to correct length and ran them through all the looms. It looked great and the quality is way better than stock.
I was also doing my own set with MSD wires, I took the red 8,5mm.
It was a hard work to drill all the donuts to the correct diameter to get the wires through.
I bought MSD wire in bulk and used the original rubber boots.
Terry you could also contact Magnecor in UK, send them your old set and they will produce you a new.
Tomorrow my countach goes to the garage for the head gaskets, I will take some pictures of the almost ready plug wire set :wave:
Best against fouling is an adequate Ignition Box like the MSD or Permatune and a correct setup distributor.
If sufficient energy is at the plug, the plug itself doesn't matter that much.
Important is to use the correct heat factor plugs.
The Countach QV has smaller plugs like bikes, I plan to use Denso Iridium Plugs but I think there is no big difference.
Just a thought. My car revs up to 7000rpm with no misfire, should I bother to change the leads and plugs now anyway. the plugs were new 6000km ago, I think the leads are original.
Of course here in Spain we do not get any moisture so no problems with tracking etc.