https://www.ajspeedshop.nl/a-57975068/bougiekabels/8-5mm-super-conductor-spark-plug-wire-sets/
Tanks for the input guys.
Since I can't get those originals in Europe, it doesn't cost much more to buy the MSD 8.5mm Super Conductors in a local American shop who has them in stock and no complaints about them. They are a bit longer because they fit 4.8, 5.3 or the 6.0. But MSD does not have them in 10 inch. But 2 inch longer won't be a trouble. Secondly they don't need heat shields. And since mine are still factory, wires and heat shields, I probably have to change a few heat shields too. And have the warranty. Since I got new spark plugs, the motor runs great again. Unfortunately I don't have much pictures of the maintenance last year, but this is how my bougies looked like:
View attachment 267847 View attachment 267848
Not sure if they where factory... I now run NGK's as far as I know, I think copper because I don't believe in lifetime sparks so will change them more often then the manuals says anyway. And tuning is indeed part of the build.