I remember seeing a tread on this a while ago. From what I remember it was fairly extensive surgery on the D1 to fit D2 headlights.
I've never been a fan of retro fitting parts from one model to another.
It always prompts me to wonder what sort of accident occurred and who the panel beater was that did not know one model from another when they ordered replacement parts.
As an example, it is always a dead give away to see an XY Falcon with XW tail lights fitted. Also when XY tail lights are fitted upside down as they fit both ways.

