Dad purchased and drilled 6 bolts for mounting the Headwinds turn signals. He said drilling them wasn’t too bad but that the stainless steel was the most difficult to drill.
The mounting bolts arrived (and were they ever packed well). I had to shorten the two for the rear turn signals to 2.1″ overall length and they worked fine. I need to get some stainless washers for the final assembly as I used some I had lying around to check the fit. I will use blue Locktite during final assembly.