For the mudguards, if you can't re-use existing mounting holes then the way I'd do it (warning - I'm not a mudguard expert by any stretch of the imagination) would be to mark out where the mounting holes needed to be, drill holes large enough to put in rivet-nuts, paint any bare metal surfaces that drilling the holes resulted in, insert the riv-nuts and then screw the mud-flaps on.
Or just drive some tech-screws into the body of the car and sell it before the wings rust off.
This is something to think about if you’re feeling gloomy. At least you’re not a car mudguard expert!
Good idea about rivnuts though, I’ll look into it. There must surely be a plastic variant that’ll do for some flaps? Proper rivnuts seem like overkill.
For the mudguards, if you can't re-use existing mounting holes then the way I'd do it (warning - I'm not a mudguard expert by any stretch of the imagination) would be to mark out where the mounting holes needed to be, drill holes large enough to put in rivet-nuts, paint any bare metal surfaces that drilling the holes resulted in, insert the riv-nuts and then screw the mud-flaps on.
Or just drive some tech-screws into the body of the car and sell it before the wings rust off.