Hello. These are the plugs in my car, never seen this type before, and looking at various adapters online, they don't look like they will fit. Are these standard for the Eunos? Any help appreciated, cheers.
That's not a wiring adapter. Some numpty has cut the plugs off and just used those screw clamps. Call someone like Autolink who will be able to send you new plugs which you can get re-attached to the wires to make sure the wiring is correct in future.
Take no chances - use a proper wiring kit as Lazza says. My attempt to re-wire similar last year almost led to a terminal fire (and we're not talking those useless screw things you have there) Cheers, Pewe.