Peter,
Here's a pic of the mounting bracket. The shop that did the work used a type of crimp on threaded insert in the back side of the bumper tubes. They initially had issues with the tubes wanting to twist when they tightened everything up...so they had to massage things a bit to get the tubes to align straight. It came out clean looking, but If I had it to do over again, I might have chose another option. The fit is really tight. We considered mounting the lights on a horizontal bar spanning between the bumper brackets, but that obscured the grill. Another option was to build individual brackets coming off of the bumper brackets from either end. The final option was to build a bracket that came off of the flat ledge of the aluminum bodywork below the grill. It appears that is where fog/driving lights are mounted on Ace's an Aceca's without bumpers...although, I wasn't sure if there is enough structural integrity on that ledge or if some strengthening beneath the bodywork would be required. Perhaps others may know about the latter mounting point and if it needs strengthening.
Here's a pic of the mounting bracket. The shop that did the work used a type of crimp on threaded insert in the back side of the bumper tubes. They initially had issues with the tubes wanting to twist when they tightened everything up...so they had to massage things a bit to get the tubes to align straight. It came out clean looking, but If I had it to do over again, I might have chose another option. The fit is really tight. We considered mounting the lights on a horizontal bar spanning between the bumper brackets, but that obscured the grill. Another option was to build individual brackets coming off of the bumper brackets from either end. The final option was to build a bracket that came off of the flat ledge of the aluminum bodywork below the grill. It appears that is where fog/driving lights are mounted on Ace's an Aceca's without bumpers...although, I wasn't sure if there is enough structural integrity on that ledge or if some strengthening beneath the bodywork would be required. Perhaps others may know about the latter mounting point and if it needs strengthening.