The older M119 like my 92 400E the plug connectors have the resistor built in it that is why it is specified no resistor plug such as the Bosch copertop and people here do not recommend the Bosch platnum +4 etc since it has a built in resistor to the tune of 5.6 K ohm. Sometime the resistor opens and the car will mis and it needs to be changed like it happened on my car a few years ago.

The spark plug wire setup is very flexible in terms of you can change individual parts like the plug end or the wire or the distributor end just by iteself. You can buy a spool of high tension wire from FastLane and cut it to size then attach crimp ends (from Fast Lane) that has threaded end that screws into the end plug on the distributor side or the spark plug connector and there is also the end connector for the coil, it is really neat to make your own spark plug wire.

I looked at converting my 92 to individual coil but I think that will be next to impossible since the engine wire harness needs to be changed as well as timing device etc. It is too much for my taste for not much gain and there could also be some hidden things that I am missing. I think you may be better off buying a newer car.