I have similar bosses in the same location but on both sides on my Mooney forks. For LowRiders. I asked Peter for LowRider bosses when I ordered the bike and he said he would not drill a fork blade. 11 months after my fork breaking and near killing me, I didn't argue and used the Blackburn U-bolts. 4 years later, I had crashed the fork and ordered a new one from Peter (with tweaks that might improve the ride), Ask again re: the bosses. He said he was willing to go the light bosses because he wouldn't have to drill. I said yes and he brazed on English bosses considerably sexier than those Carton bosses. 5/16" bolt so I have to enlarge the rack holes but they have worked flawlessly.

And a comment on the lights BITD. I bought the then common generator light and mounted it on my new Peugeot UO-8. Ridign home at 9pm, I passed a single parked car relatively close because I knew there was a car a ways behind me. The parked car was dark and under a streetlight so I could not see inside. Door opened and I hit it. (The door was history. I walks away with just two perfect 1" bruises on my thighs form the bar ends. Crooked bars and brake lever.)

I realized afterwards that the light was not bright enough. It allowed me to feel secure but offered none. I took it off and rode without a headlight for 25 years until there was a good halogen light. The entire time I rode with a light strapped to my ankle. Drivers saw that, even BITD when it was a 2 C-cell job. (There is no other light that goes up and down. Different attracts attention.)