Like most of us here in Oz, except Boxhead in Alice, I've been going stir crazy with the rain of the last two weeks. I did however get to sort out one of those simple issues which aways seems to take me hours and hours of procrastination to address. In this case is was the driving lights.
Original Marchals cost about the same as the rest of the car combined but they have a unique style of mounting bolt - out the back of the casing - which makes it hard to buy something off-the-shelf. I found some low cost lights on eBay which fitted the opening and had a metal casing which I could modify to suit.
Ground off the heads of the rivets holding the original mounts and drilled a hole in the back of the casing.
I welded a washer (spreader plate) to the head of a 10mm bolt and poked it through the back of the casing and tack welded. I turned down the head of the bolt to have clearance to the lamp itself.
I spread a bit of plasticine on the back of the opening in the bodywork and pressed in the light to find the location for the mounting hole.
I slapped a bit of paint on the retaining ring to give it a Marchal look. Happy with the outcome.