You need different looms as the plugs on the Mk1 are different to those on the ST170 headlights. The actual headlights fit perfectly.
When I had mine back in the day, I was lucky enought to buy them of FFOC but there isnt anybody that im awair of that sells them. There is an how-to guide somewhere on the FFOC forum but you need to be a paid up member. Mine were made using Audo plugs, remember seeing the logo on one of them.
These were mine with them on.
Andy