If you start producing brackets again, I suggest that you redesign the attachment area.
In the original, a hex-headed bolt will not fit properly. The bolt hole is at the end of a v-shaped area and there is not room for the common hex-headed bolt to fit. I originally used some washers to make it work, but that is an unsatisfactory solution. Of course, a Allen-headed bolt will fit. But, that means there has to be an Allen wrench available if you ever need to use the tow hook. The Allen bolt that I bought takes a different sized Allen wrench than the one in the tool kit.
In the original, a hex-headed bolt will not fit properly. The bolt hole is at the end of a v-shaped area and there is not room for the common hex-headed bolt to fit. I originally used some washers to make it work, but that is an unsatisfactory solution. Of course, a Allen-headed bolt will fit. But, that means there has to be an Allen wrench available if you ever need to use the tow hook. The Allen bolt that I bought takes a different sized Allen wrench than the one in the tool kit.